Refrigiwear Men's Flex-Wear Bottom Lightweight Base Layer Pant, Black Flex-Wear is an extremely comfortable material that flexes and stretches with your movements. Best of all, it is very thin and lightweight, providing you with warmth without weighing you down. Versatile base- or mid-layer top that features a front fly Extremely comfortable bottom with 92% polyester / 8% elastane plus 4-Way stretch, brushed inner lining Brushed inner lining also serves to trap heat, making the Flex-Wear Bottom perfect for colder environments or winter days in the outdoors Anti-microbial treatment provides protection from germs and mildew while anti-static finish helps you avoid annoying static electricity build-up