Military Thermal Underwear, Base Layers & Long Johns

Whether you're gearing up for a frigid field op or just need an extra layer for winter, our military thermals and cold weather underwear deliver warmth, comfort, and durability. Explore Army-issued polypropylene thermals, long johns, base layers, and full-body union suits all made to military specs for cold-weather performance. From lightweight briefs to heavyweight tops and bottoms, our collection keeps you mission-ready no matter the temperature.