Keep warm and snug with this pack of 3 men's thermal vests from Heat Insulators. The short-sleeved undershirts are made from a soft cotton jersey fabric, with a 50/50 cotton-polyester blend and heat trap technology to retain body heat. Perfect for layering under clothes in cold weather, the vests feature a classic block pattern with a simple t-shirt style. Machine washable and available in sizes S-XXL, these thermal vests are a must-have for any man's winter wardrobe. Stay comfortable and stylish without sacrificing warmth with Heat Insulators' THERMAL SOFT undershirts.