Rothco ECWCS Gen III Mid-Weight Underwear Bottoms (Level II)Get ready to combat the cold with our ECWCS Gen III Level II Underwear Bottoms. Made from breathable, mid weight grid fleece material that is great for layering, the thermal base layer military underwear is designed to keep you warm, comfortable, and dry, even in the harshest weather. The waffle thermal also features anti microbial and anti odor defense, ensuring that you stay fresh and clean through winter combat missions and cold weather activities.