Stanfield's winterweight underwear is made with blended fibres to provide nearly double the wear of 100% cotton fabrics. Thermal waffle knit provides substantial warmth. 50% Cotton/ 50% Polyester Made in Canada Shoulder and back neck seams are reinforced with tape for comfort and strength Set in sleeves contoured for free and easy movement Machine washable and dryable Stanfield's Thermal Long Sleeve Shirt