The warmest Under Armour base layer on the market. Odor-reducing ArmourBlock® technology keeps them fresh for multiday wear. Flatlock stitching and ergonomic seams prevent bunching and offer an unrestrictive fit for total comfort. Working fly and a performance waistband. Made of heavyweight 7.25-oz. 96/4 polyester/elastane for premium softness and stretch. Fitted. Imported. Sizes: S-3XL. Color: Black.