Polyester Extended Cold Weather Clothing System (ECWCS) Poly Bottoms are a crucial base layer designed to shield you from the harshest elements. Crafted from 100% polyester with a plush fleece lining, these bottoms ensure optimal warmth and comfort. The full-cut design adds an extra layer of comfort, making them ideal for extended wear. Don't forget to explore the matching tops available in both Crew Neck and Zip Collar styles to complete your cold weather gear ensemble. Embrace superior protection with ECWCS Underwear collection.