4 layers of mesh + aluminum + non-woven fabric + cotton are quilted It is supple and has a great needle experience. Standard: 4.6 ft (1.2 m) wide x 3.3 ft (1 m) heat retention use; For general applications that require heat under a throw, vest, thermal sheets, blanket, or other items that require heat retention, General purpose features a plastic bottle cover, lunch bag, or cold insulation for cold retention, Highly easy to sew; Micro fibers provide heat retention and cold retention; Mesh for long lasting clean; Thin and lightweight, dry-cleaning (petroleum type). Compatible Materials: Mesh Fabric: 100% polyester; Aluminum sheet (aluminum); Non-woven fabric (70% polyester, 20% nylon, 10% rayon); Filling: 100% polyester.