Elite Survival RECON-4 Sleeping Bag, Olive Drab Outer top shell made from 210T Rip stop Nylon with a Teflon finish Outer bottom shell made from 210D Nylon Oxford with PU2000mm waterproof finish 200gm per square meter DuPont Thermolite Micro insulation Insulation is flat filled to prevent cold spots Insulation incorporates an ultra-thin barrier of anti-bacterial pure silver micro fiber which also increases its heat retaining capability