Our Coyote Tan DoorJamm is made of a natural gum rubber. This is the most elastic of our products. This product is extremely versatile, reusable, easy to carry, and chemical resistant. The Tan Jamm will withstand temperatures as hot as 220 Degrees Fahrenheit and as cold as -70 Degrees Fahrenheit. This product weighs under 1 ounce and can be stored nearly anywhere on your person or kit.