Kydex
Kydex is a line of thermoplastic acrylic-polyvinyl chloride materials manufactured by Sekisui SPI. It has a wide variety of applications, including for firearm holsters and sheaths for knives.
Similar acrylic polyvinyl chloride material (IPK Acrylic-polyvinyl chloride) is manufactured by Emco Plastics and Interstate Plastics, which carries nearly identical properties with an added layer for screen printing.