Uncle Mike's Inside The Pant Holster, Size 16, Fits Medium Auto With 3.75 Barrel, Left Hand, Black 89162 These inside the waistband holsters are ultra thin four layer laminate that are no thicker than conventional suede leather holsters. The internal moister barrier won't transmit perspiration to the gun and the smooth nylon lining make for an easy draw. This is the open top style.