Army Universe Men's Cold Weather Fleece-Lined Thermal ECWCS Bottoms Pants Drawers with Pin Made from polyester material. Durable material that will last a long time. Comfortable outer with fleece lined inside material, that is super soft and extremely comfortable. Part of the ECWCS Clothing System Gear - Extreme Cold Weather Clothing System product. Stretchy waist band and soft ankle cuffs. Triple stitched waist to ensure long lasting quality band. Opening fly front that is 5.5" long for easy access underneath. Designed to copy original GI thermals. Choose from our 4 available colors: Black, Desert Sand, Brown or Coyote Brown which is AR 670-1 Army Compliant color. Wear it as thermals, underwear shirt or undershirt and be sure to stay warm during those brutally cold winter days. These thick thermals are exactly what you need during those cold snowy winter windy days.