Our heat cushions are made of Teddy Fleece, more commonly known as polyester. To this is added Spandex, which makes the fabric stretchable but also returns to its own shape easily. It is also known as elastane. It helps make clothes and fabrics more comfortable because it can stretch and adjust to your body. Thanks to the combination of the two fabrics, our heat products are immensely soft, nice and light and retain heat well. In addition, the combination ensures that the fabrics do not wrinkle.