Waffle knit fabric creates pockets of trapped warm air throughout the garment to add additional insulation to your body. Double seat for additional warmth and durability. Cuffs reinforced with spandex for comfort and shape retention. Leg gussets give thighs extra room for proper fit. Plush back signature waistband. 50% cotton for comfort and 50% polyester for durability. Tall fit has a 3" longer leg and a 1" longer rise. Used for moderate to very cold weather.