Kydex is basically a miracle material. This specialized thermoplastic is both extremely rigid and easily molded when heated. While originally designed for airplane interiors in the 1960s, custom Kydex knife sheaths for fixed blades and firearms started to emerge in the 1970s as more people began pursuing alternatives to traditional leather sheaths. We are happy to offer a selection of these rugged sheaths that are made to fit a number of the knife models we carry. If you are looking for an alternative to your leather, plastic or nylon sheath, you need to try one of our kydex sheaths.