Edelrid Duke Slate Pebbles. With its large adjustment range and safety features, the Duke is ideally suited for training and rental use. The Duke is fitted with two EDELRID Easy Glider buckles in the waist belt and fully adjustable leg loops. The two-buckle system in the waist provides for optimal centering of both the tie-in loop and the haul loop at the back regardless of climber size. Additionally, there are four flexible gear loops, and the Hytrel®-Protector on the tie in loop safeguards against rope abrasion. As a fully adjustable, comfortable harness, the Duke-s components and features also make it a great all-around harness.