Get ready to dominate the elements with our ECWCS Gen III Level II Underwear Bottoms. Made from breathable mid-weight grid fleece material that’s great for layering the thermal underwear is designed to keep you warm comfortable and dry even in the harshest weather. The waffle thermals also feature anti-microbial and anti-odor defense ensuring that you stay fresh and clean through various outdoor or winter activities. Rothco is the foremost supplier of military tactical outdoor survival clothing and gear.