This model is constructed of the innovative SafariSeven™ material, a unique nylon blend from DuPont™. SafariSeven is highly durable and practically impervious to the elements. This holster features ALS® (Automatic Locking System) design for secure weapon retention. With an instinctive drawing motion, once the weapon is holstered, it locks firmly into place. Upon a proper shooting grip, the ALS device is de-activated by the thumb and the holster is released with a simple straight up draw. Single Leg Strap.