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.
Pre-Cut Size: 45 inches x 1 yard
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.