Stanfield's Waffle(thermal) Long Underwear - 6622Our cotton poly thermal long underwear is made from a waffle knit fabric that creates pockets of trapped warm air throughout the garment to insulate your body, making it ideal for moderate to very cold weather. Our thermal long underwear features cuffs reinforced with spandex for comfort and shape retention, double seat for additional warmth and durability, our plush back signature waistband, and leg gussets give thighs extra room for proper fit.??