Our Cold Weather Lightweight Thermal Underwear is officially known as "DRAWERS, LWCWUS" in the US Military. These thermal long johns are designed to be a lightweight pair of cold weather long underwear. Highly effective and ultra comfortable for operating outside in cold weather conditions. Thermal underwear has an extensive history of keeping you warm in cold weather conditions. Everyone from farmers, sportsmen, and soldiers knows that wearing a good base layer like these cold weather lightweight thermal underwear is the key to staying warm in cold weather conditions. With there being many manufacturers and types of thermal underwear, you may wonder what pair is the best -- we think you'll agree that military grade thermal underwear like these is the best you can buy. Features: Authentic US Military Cold Weather Thermal Underwear Lightweight - Designed for Active Outdoors Use Combat Tested and Battle Proven Design Coyote Brown Made from 100% Polyester