Ka-Bar 2-5016-3 Small Hard Black Sheath is made from Kydex, which is basically an acrylic thermoplastic that has good resistive power. This sheath works like a protective covering for your blade and offers protection from most of the chemicals such as petroleum, salt waters, moisture and even any other solvents. The Kydex sheath ensures that the sheath remains in a proper form and doesn’t not crack or shrink in the extreme conditions. There is a pommel snubber strap that is added to this sheath for additional security. Thus, allowing the user to take this knife anywhere like underwater, sky jumps and dense under brush.