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Keep Hot Hot and Cold Cold with Thermal Fabrics

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Years ago the Thermos® company had the slogan, "Keeps hot things hot and cold things cold." You can't say it much better than that. Did you know there are fabrics that help you do the same thing? These aren't the heavy industrial materials that keep steelworkers, astronauts, and firefighters safe, but honest-to-goodness fabrics you can actually sew with. 

Thermal fabrics are useful for all kinds of projects where you want to keep hot stuff hot and cold stuff cold, such as pot holders and oven mitts, table pads, lunch carriers, shopping totes, ironing board pads, outdoor stadium cushions, tea cozies, and many other items.

And, because of the metallic coatings common to many of types, and the fact that they're easy to sew, you can even use them to make some pretty creative costumes – from medieval armor to Lady Gaga!

The options fall into three basic categories: 

  • Thermal Batting, which has insulating properties.
  • Thermal Fabric, which can withstand high temperatures without scorching.
  • Thermal Interfacing, which is a lighter weight insulating option.

An important note about microwaving: The materials listed below that have a metallic layer specifically say, "Do not microwave." None of the rest actually state they are safe to microwave either. So for any kind of thermal fabric, unless it specifically says it's microwavable, we recommend you don't risk it. One exception, described at the end of this page, is Wrap-N-Zap by Pellon, which is specifically designed to be microwaved.

Thermal Batting


The thermal batting product that's been around the longest is Insul-Bright from The Warm Company. It's made with hollow, polyester fibers that have been needle-punched through a nonwoven substrate, and then through a reflective metalized poly film. The needled material is breathable. The hollow fibers insulate by resisting conduction. And the metalized poly film resists radiant energy by reflecting it back to its source.

It contains no resins or glues and will not shift, migrate, or bend. You could use it in clothing, but it would be rather noisy. However, babies and animals often love the noise and like to scrunch it up in soft books and toys.

Insul-Bright is machine washable, easy to cut to size, and apart from being just a bit slippery, is quite nice to work with. Most sources offer it by the yard in 22" and 45" widths, and a few outlets offer 36" x 45" pre-cuts. 

Even though we've listed this material in the 'batting' category, The Warm Company does suggest considering two layers or layering Insul-Bright with a standard cotton batting if you are using it for a high-heat application.

A number of sources offer Insul-Bright online, including Fabric Depot, Jo-Ann and Fabric.com. It's also readily available at many local fabric and craft stores.


This space-age thermal batting from The Warm Company was originally designed for insulating air conditioning ducts or wrapping your hot water heater (for which it's very effective). But Insul-Shine is actually quite sewable.

You can make something simple, like a reflective visor for your car or to put in your RV windows to prevent sun damage. If you're looking for a mod metallic look, you could also use it to cover a headboard, throw pillows, or make a budding astronaut very happy with some rocket wall art.

Insul-Shine has two layers, reflective material and insulating polyester batting. The metal surface wipes clean and actually acts as a water barrier for soft coolers, diaper bags, and bottle carriers.

It is washable, but doing this may dull the reflective side. Sold in 22" and 45" widths.

You can find it at Amazon and Fabric.com among others.


Also made by The Warm Company, this thermal batting is very similar to Insul-Shine, but Insul-FAB has an additional layer of white lining-style fabric. It's a good solution when you want a smoother and more comfortable finish on the interior of your project. 

Because it's designed not to show the insulation, it's perfect for insulating totes, lunch sacks, casserole covers, and more.

It's also machine washable and dryer-safe. We found Insul-FAB by the yard in a 22" width at CreateForLess.com and in a 45" width at Fabric Depot.


Solarize, a new thermal product by Fairfield, is a uniquely thin metallic insulating fabric. Less noisy and crinkly than other offerings, Solarize still creates a strong thermal barrier that keeps things hot or cold. And it works with the shiny side in or out – you choose. Keep the shiny side exposed to help conduct heat or reflect light. 

It is a sew-in product, made of 50% polyester + 50% aluminum, and the standard width is 22”. You can purchase it as yardage or get it in a “grab-and-go” pre-cut package of 22” x ¾ yd.

Use Solarize inside pillows, fabric scarves, mittens, jackets, hats, and blankets for added warmth. Add it to casserole carriers, potholders, and trivets.  Cool things down by Solarizing inside can cozies, thermal freezer bags, or ice pack wraps. 

You can purchase Solarize directly from Fairfield or find it Walmart and other retailers. You can also buy full bolts from Amazon.

Thermal Fabric

Iron Quick

Iron Quick is a specialty fabric made of 100% aluminum with 100% cotton backing. It's designed to protect from heat (up to 399˚), but does not have any insulating properties so it's long been the go-to choice for things like ironing board covers. 

When you need insulating as well as heat protection, like in your oven mitts, Iron Quick also comes as a quilted material. This is simply the regular Iron Quick fabric with a 100% cotton backing, plus polyester batting and a polyester/cotton backing. This doesn't afford a huge amount of insulation, but you could use more than one layer or add a layer of regular or thermal batting. 

Both varieties come in the same 45" width. When sewing, you should use a size 80/12 needle. 

Neither Iron Quick products should ever be used in the microwave.

Both can be machine washed but should then be air dried – not tossed in the dryer. You can also use a damp cloth to wipe clean.

Nancy's Notions carries both types of Iron Quick products by the yard.

Therma Flec

Therma Flec is a lightweight, heat resistant cloth similar to the Iron Quick but made from 80% cotton/20% polyester. It is scorch-proof to 360˚, but like the Iron Quick cloth, does not provide insulation. However, also like the Iron Quick, you can find Therma Flec in a quilted version for items such as hot pads, oven mitts or ironing board pads. 

Both the flat cloth and the quilted option are available in two colors: silver and light gold, all in a 43-44" width. Don't put this product in the microwave.

We found Therma Flec, in both colors, several places online, including Fabric.com and OnlineFabricStore.

Thermal Interfacing


Back in the 1980s, the 3M Company introduced an amazing new insulating material called Thinsulate. Ounce for ounce it had one and a half times the warmth of down and twice the warmth of other high-loft insulation materials. It meant you could get sleek ski gloves that were just as warm as giant, puffy mittens.

A quarter century later, Thinsulate is still amazing. Made from microfibers that are only a tenth the size of of other synthetic insulation, it's much more effective at reflecting back heat. And Thinsulate absorbs less than 1% of its weight in water, allowing it to retain its insulating ability even in damp conditions. You can use it in any kind of project where you want to keep warm but don't want a lot of bulk, such as jackets and blankets.

You can get varying densities of Thinsulate, depending on the weight and R-value (insulating property) you want, from 1.6 up to 2.9.

Thinsulate is machine washable and dry cleanable once you have sewn it inside your project. It is a bit tough to find as yardage, but we did locate Thinsulate online at Vogue Fabric Store and The Rain Shed. It's available by the yard, 60" wide.



Pellon makes a 100% polyester interfacing called Thermolam, which is a needle-punched fleece with a protective scrim that can provide some warmth. It's available by the yard at a 45" width as both a sew-in or a fusible and is machine washable. It's considered a heavy-weight in the general world of interfacing, however, it doesn't have any loft, so it isn't a choice for projects that call for high-level insulating and/or padded properties.

There's no microwave warning for this fabric, but then again, we couldn't find anything that said it was okay to use either. Maybe you should just forget the microwave, huh?

Fabric Depot offers a good price on Thermolam by the yard (both sew-in and fusible). 


Wrap-N-Zap by Pellon is the only thermal product mentioned on this page that we can safely declare to be microwave safe. It's got Zap in its name and it says "Microwave Friendly!" right on the package.

Made from 100% cotton batting, without glues or other chemicals that could leach into foods, Wrap-N-Zap is designed for projects like insulated baked potato bags and casserole warmers – situations where you heat up the food inside the cover and leave the cover on to keep food warm.

You can machine wash Wrap-N-Zap after you've sewn it into a project, but you should only use cotton fabrics, threads, and trims to insure it retains its full microwave-safe designation. 

We found it in a 45" x 1 yard package at Joann Fabric and Nancy's Notions.

Thermal fabrics are a "hot" trend

When we first researched this topic several years ago, we could only find about four kinds of thermal fabric or batting that was sewable and relatively easy to locate as yardage. Now we're finding a lot more options. And we didn't even include all the new energy-saving materials you can sew into things like super thermal window shades. It's nice to see the selection growing. 

Be adventurous and try some projects that are made to keep hot things hot, and cold things cold. Below are a few Sew4Home projects to get you started:

Casserole Carrier

Insulated Baby Bottle Carrier

Lunch Bag

Picnic Tote

Hot Pads

Oven Mitts

Two-Handed Potholder


Comments (76)

Jean Aitken said:
Jean Aitken's picture

I would like to make place mats for my dining table from dupion silk. What  smooth fabric would you advise me to use as an interfacing to prevent heat transferring from hot plates/dishes onto the wooden table? Thank you

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Jean - For placemats, probably one of the thermla fabrics described above would be best. Another option would be to use standard batting layered with the Solarize. The Insul-Bright would also work, but for a placement, its "crinkly" sound would probably not be optimum when setting out plates, etc. 

Cara32 said:
Cara32's picture

Hi, It might sound silly but I was lookind for a fabric that I could use to make curtains/blinds for my conservatory. Ideally they need to have that insulating properties and be lightweight.  Any suggestions?

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@Cara32 - Not silly at all! I don't know that any of these products are quite right for your application. You might take a look at the Warm Window product from The Warm Company (they make several of the products above). It's not super lightweight, but could work, depending on your windows: https://warmcompany.com/products/warm-home/warm-window

strowbridge@acfenv.com said:
strowbridge@acfenv.com's picture

I am looking for fabric to put inside cat houses that stay out in the cold.  I wanted a fabric that would more or less insulate their body heat as they laid on it.  Thanks!

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@strowbridge - We don't have a 100% solution for you since that's not a situation we've tested. I know a lot of those outdoor houses have an actual heating pad that is weight-activated. You'd likely be best off with on of the thicker thermal battings, like the Insul-Fab -- then you'd want to layer that with one or more additional layers of fleece or wool or another heat-retaining fabric top and bottom, and perhaps even add a water-resistant layer at the bottom. Unfortunately, no one layer is likely to be magic enough to do the total job. 

Brian said:
Brian 's picture

Hello, I'm looking for a insulatig material that would have a moisture barrier to it and maintain the isulting properties of keeping cold things cold. I would prefer something that can be sewed and or glued. It would also need to be safe for food contact etc. Also, this product would need to be something that is reasonably economical, in other words not real pricey. 

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Brian -- sorry, but there isn't one product that we know of that has all those properties. You would likely need to combine a thermal batting with a water resistant material like a PUL - in terms of food-safe, there is a lot of chatter online about whether people feal that PUL is food safe. We don't make any projects for direct contact with food, so we can't advise on that with any of our own test results. You'd want to do a bit of your own research to see what you feel most comfortable with. 

ben10 said:
ben10's picture

wow i reqally loved this thermal insulater. Thanks. 10/10.  love from Ben10 

Gail B said:
Gail B's picture

Several ladies and I are making bib aprons for ladies who cook for 600 school children in Panama. These ladies cook over very hot large woodburning stoves.  What could we use to insulate the aprons that would reflect the terrible heat?  Thank you.

Sue M said:
Sue M's picture

Gail, Thick (>1/4") Wool felt or nylon felt would be fire-resistant insulating materials. Cotton batting can burn easily. You could add a thin layer of reflecting material on the front, but only if it breathes, so that the ladies can sweat and don't swelter, and only if it doesn't melt easily. Better to concentrate on using very thick insulating felt than finding a plasticy aluminized layer that will melt when it touches the oven. Test a few prototypes before making the whole set of aprons. Nomex makes fire-resistant nylon blankets and batting. Fabric Depot sells nylon batting for ironing boards. Think of making an apron-shaped ironing board, as they can take direct heat, rather than an insulated curtain that never makes direct contact with a heat source. Also make sure they're easy to wash or wipe clean, as cooking can be messy, and grease and liquid can splatter. Remember that Panama is a hot, humid place.

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Sue - thanks for weighing in with such good suggestions.

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Gail - That's a tough and very specialized situation that involves fire! The Insul-Fab and Insul-Shine are the most reflective, but you'd likely want to sandwich either with a fire resistant type of material - and both products are a little more bulky, but with a heavier weight cotton or canvas on the front and back, it would likely compress and be pretty comfortable. Good luck with your research; let us know what you end up trying. 

Carol P L said:
Carol P L's picture

Which thermal fabric would be best suited to make reflective sun shades for the front window of my RV?

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@Carol P L -- As mentioned above, the Insul-Fab or Insul-Shine would likely be best for that application. 

Scratch said:
Scratch's picture

Hi, great site and very informative! Any idea what I might use to cover sunglasses to prevent their cooking in the car?
Thanks again!

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@Scratch: Do you mean just a sunglass case? If so, the Solarize would be a good option as it is the thinnest and you could then layer it with a "more attractive" fabric for the outside of the case. But in reality, I think just about any kind of sunglass case would help protect them. 

Anonymous said:
Anonymous's picture

Hi Liz,

I would like to create a liner inside the compartment to hold glasses in the ceiling of the car.  So it must be thin and malleable to fold and insert it into the compartment.  Do you think Solarize would suffice?


Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

Wellll... the Solarize would certainly be thin and flexible enough for what you describe. I can't guarantee how much heat reflection it would provide since yours is such a special situation, but it seems like it should work in theory. Keep us posted. 

Sharma Xyйarma said:
Sharma Xyйarma's picture

hello, what material would be best for sitting on it? i need something that i can put on a cold bench or cold soil to sit. then i want to fold it into a much smaller piece and place it in my pocket for next use. machine washable and waterproof, and that will not break many times folded and unfolded.

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Sharma - The Solarize is probably the closest option to what you are describing, however, it's not really meant to be used on its own - it is really meant ot be layered without other fabrics. You might be better off with a classic Survival Blanket type of product - they are small, thin and great at reflecting heat back to your. They are usually meant for single use but are quite inexpensive. Here's one from Amazon: http://amzn.to/2c6GtNx

Sharma Xyйarma said:
Sharma Xyйarma's picture

Fair enough, though survival blankets are too thin and too big for my use. i need just a little piece to sit on, lets say 15inchesX15 inches max. to reflect the cold to the bench (or stone) and my heat back to me. 

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

Cut one down into smaller pieces... it makes one blanket go even farther. 

Guest1928 said:
Guest1928's picture

I'm sewing a lunch bag with insul brite and pul. I was wondering if it would isolate better if I used 2 layers of insul brite oder a layer of each insul brite and cotton wadding or if a simple layer of insul brite would be enough. Thank you 

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Guest1928 - It's really up to you. More layers of Insul-Bright will certainly add more ability fto keep things cool. The batting will add softness but won't really increase much if any of the insulation capability. Another variable will be if your pattern can handle the extra thickness in the seams and/or the binding. And finally, you should also take into consideration how much cooling control you really need or want for our lunch bag. 

Guest1928 said:
Guest1928's picture

Thank you for the quick reply. It gets quite hot where we live so 2 layers might be better. Thank you for clearing up that batting won't really be necessary as I wasn't sure.

Leigh Fraser said:
Leigh Fraser's picture

I need to sew a backing on a pair of curtain panels to help keep heat and cold out of a bedroom.  The curtains are made of polyester and are almost blackout but are not thermal as advertised.

Do you have any suggestions?  Thank you.

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Leigh - The options we reviewed above aren't necessarily the best for windows, however, you might check out the folks at The Warm Company, who manufacturer several of the options above. They have a Warm Window division and may be able to help you out: https://warmcompany.com/products/warm-home/warm-window

Mary Quaid said:
Mary Quaid's picture

Thanks for your great service!  I am replacing two dormer windows in the attic with high end wood windows.  The window glass will have some insulation properties and the windows will be non-operable.  Unfortunately and because the way the attic "dead ends" directly into the dormer window, the space is too tight to install any type of shade.  With the new windows, I will be given an oppoutuity to staple or otherwise affix fabric to the inside frame of the new wood windows PRIOR to installation.  I don't necessarily need black out fabric and wouldn't mind some light coming thru.  I do need something that is not see thru.  My preference would be white or off white and something that does not look industrial since the dormer windows are on the front of my residence.   Any suggestions?

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@Mary - That is a very specialized situation for which the products we've outlined here don't really apply. You might check out the folks at The Warm Company, who manufacturer several of the options above. They have a Warm Window division and may be able to help you out: https://warmcompany.com/products/warm-home/warm-window

Jamesrh said:
Jamesrh's picture

I think all of your information is great! I am wondering if you know of any companies that can do custom cutting/sewing work for a project that my office needs. Also, can you say if any products that you've tested would be better than others at being heated to 150° or so constantly? I appreciate any information you may be able to provide. Thanks!

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@Jamesrh - Thank you. For cutting/sewing work, you should search in your local area under "contract sewing." We haven't tested any of the materials at 150˚ for consistant times and so can't give you advice on that. You might be able to reach out directly to the manufacturers to see if they have specific test results. 

Jamesrh said:
Jamesrh's picture

Thanks for your response, I will continue to research for our project. If I learn anything interesting, I'll let you know!

Susan Taylor said:
Susan Taylor's picture

The pipes on my motorcycle get really hot and burn the inside of my leg.  I'm looking for fabric I could sew into my jeans or chaps that would provide some protection from the heat. Any suggestions?

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Susan - We're always a bit reluctant to give suggestions on specialty situations we haven't experimented with, but in general, it seems like you would want something like the Thermaflec that woud be more "fabric like" and so could mold to your exterior jeans or chaps. Perhaps someone at a local motorcycle shop could provide more expert advice. 

Amit sharma said:
Amit sharma's picture


Can anyone tell me the fabric name for keeping water cold for drinking purpose and where to buy.

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Amit - Sorry, we do not have any formation on fabrics that could be used to directly hold water (like a water bag). All the insulation materials we've seen are for keeping a container of water cool. 

Jonathan said:
Jonathan's picture


I am looking for a heat reflective fabric that I can put on my child's car seat.  In the summer, the car seat gets terribly hot and makes sitting in uncomfortable for my child.  Any recommendations?  

Sue M said:
Sue M's picture

Jonathan, Covering the car seat with a large terrycloth towel (to shade it from sun) when not in use is a good first step, but I found the following to be much more effective. Keep a few king-sized pillows (or one lofty sleeping bag) in the car. Bury the child's car seat under the pillows before you leave the car or go into the store. That will keep the car seat cool much longer while you are in the store. This saves you the hassle of preparing and lugging cold packs with you. Secondly, you could add an insulating layer between your child's back/bottom and the car seat. Holy Lamb makes a wool felt "piddlepad" or mattress topper that could be cut up into the shape of a car seat cover or pad. Child car seats have cheap foam padding that doesn't insulate as well as thick (>0.25") wool felt does. Finally, If you carry the wool felt cover into the air-conditioned store with you while you shop, that will help keep it cooler for the car ride home.

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@Sue - again, thanks for adding your comment with such detailed throughts.

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Jonathan - No fabric is really perfect for that on a DIY scale, although some people really like terrycloth. It's pretty hard to make the heat go backwards into the seat. One of the most popular things I've seen out there is a child's car seat cover with a series of horizontal pockets into which you can slip ice packs, like you would use for a lunchbox. They seem to keep the seat cool for a number of hours while out and about. We don't have a project for that here, but if you search in Google or on Pinterest, you'll find quite a few. 

Jonathan said:
Jonathan's picture

@Liz - Thanks for the reply.  I'm not intending to make the heat go backwards into the seat.  What I am after is a fabric that will reflect the heat (especially if the sun is beating down on the seat). Perhaps something like Solarize?

Out of curiosity, why do people like terrycloth?  

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@Jonathan - Anything that reflects is still gong to be absorbing some heat as it reflects - think of it like those shades you use across the windshield. That material helps reflect the light and heat, but I don't think you'd want to sit on it. These are great products for helping keep in the hot or cold, but as I mentioned, there really isn't anything that I know about that can both help reflect the heat and light white still keeping itself cool. That sounds like a job for NASA I think . A lot of people use terry towels becaues they are usually all cotton and do a good job of absorbing heat without getting too hot and sticky. But even they eventually get hot - just not as hot as plastic seats. Take a look at those cooling pouch car seat covers; they look pretty interesting. 

Mpaltura said:
Mpaltura's picture

Hi! I want to make a case to put around a hardshell flute case.  I want it to keep the flute from getting cold and to protect it from the heat if it were to be left in a car.  What materials would be good to use to make a flute case??

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Mpaltura - Wow - a flute is an important thing to keep protected. We don't really have the expertise with that sort of specialty use to know what would be best. I'd hate to give you the wrong recommendation and possibly damage your instrument. There are also several variables that would come into play, such as how much protection the main case provides as well as how hot and how cold you are protecting against. It would probably be best to ask this question of someone who specializes in traveling cases for musical instruments. 

Warren Dorer said:
Warren Dorer's picture

I am a leather artist. One of the products that I make are wine carriers. I am looking for a thin product that will both insulate and cushion a wine bottle preventing sweating or breakage. Your thoughts?

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@ Warren - We don't work much with real leather, so don't really know all the ins and outs. In general, finding one product that can do all those things is likely to be a challenge. The thermal battings aren't really meant to have any water resistant capabilities. You may need a series of layers. The Fairfield Solarize product is by far the thinnest as a thermal barrier. You might consider sandwiching this with a plain or quilted batting and a PUL type barrier on the inside. Fairfield (and others) also have a PUL product. There is theirs: https://www.fairfieldworld.com/store/category/shield-liner-fabric-craft-...

You can get both the Solarize and the Shield in small, fairly inexpensive sample paks, which would be a good way to do a test.

Warren Dorer said:
Warren Dorer's picture

I am a leather artist. On of my products is a single/double wine carrier. A wet or sweating cold wine bottle might bleed thru my leather causing damage. looking for a fabric that I can sew to the leather prior to construction to alleviate this potential problem. Your thoughts?

NewSewer said:
NewSewer's picture

im looking for a wide fabric that is reflective to make a shade cover on my sailboat. A friend had one made, but I've found those who make canvas for boats don't want to give up their secrets.  Has anyone seen anything like this?  It really reduced the heat underneath his cockpit canvas significantly.

Liz Johnson.Editor.Sew4Home said:
Liz Johnson.Editor.Sew4Home's picture

@NewSewer - I'm afraid that's a specialty issue we don't have any familiarity with. You might try reaching out directly to The Warm Company who makes several of the these thermal batting products. Perhaps they have a more "industrial" width/option they could share with you. 



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