Waffle knit fabric creates pockets of trapped warm air throughout the garment to add additional insulation to your body. Fabric is 50% cotton for comfort and 50% polyester for durability. They have a plush back Signature elastic waistband with scalloped edging. Flatlock stitching throughout to prevent chaffing. Long rib cuffs to keep heat in and cold out. Generous sizing. Made in Canada.