DeSantis Gunhide Slim-Tuk, IWB Holster, Fits Springfield Echelon 4 With or Without Optic, Kydex Construction, Ambidextrous, Black 137KJ8ZZ0 The Slim-Tuk is a minimal ambidextrous IWB holster fashioned from Kydex sheet. One of the most unique features about this IWB holster is that it uses their tuck-able 360 C-Clip, which affords the wearer unlimited mounting options. The hardware can easily be reversed to change from right to left hand. The Slim-Tuk is precision molded and has adjustable tension and a rugged 1.75" nylon clip.