Tactical HDL Kydex Holster for P226Description Kydex is a water and corrosion resistant polymer. Front Lines Kydex holsters are solid and yet well fitting, tough and durable. Frontline's holsters are made of Kydex sheets, in a pressing process not injection which make them stronger and durable. Each Kydex holster works the same from the first day you try it until you retire it. The Front Line Head Lock retention system is an excellent level 2 retention system for tactical and duty