Layer up and stay warm in extreme cold weather with Milspec Heavyweight Thermal Knit Underwear Top. This reliable piece of cold weather gear features a raschel knit composition that is designed to maintain its shape for years of use. The comfortable elastic ribbed knit cuffs provide a seamless thermal seal between your extreme cold weather gear and gloves. This thermal underwear shirt is perfect for soldiers, tactical professionals, hunters, skiers, and anybody who enjoys the great outdoors.