Stanfield’s Waffle (Thermal Combination) Onesie -6603 (6600)Waffle knit fabric of our thermal combination underwear creates pockets of trapped warm air throughout the garment to insulate your body, making it ideal to wear in moderate to very cold weather. This one piece underwear has great durability and features full button front, cuffs reinforced with spandex for comfort and shape retention, trap door on back with button closure. Fabric: 50% cotton 50% polyester