Kydex T Sheet .080, 8" x 12" Thermoforming Material for Knife Sheath & Holster Making , P1 Haircell Texture, Calcutta Black Kydex is an extremely durable acrylic/PVC alloy Kydex s more concealable. Kydex has no break-in period Kydex is weather-proof Kydex is easier to clean and keep clean.