Xelero Summit Men's Comfort Therapeutic Extra Depth Hiking Shoe Leather Lace-up Leather Rubber sole The Xelero XRS Technology provides greater stability and control. This cutting edge system supports natural gait pattern. The XRS technology is integrated in the midsole. The flat outsole provides optimal stability, while the propulsion element promotes a laterally stable forward propulsion, without changing your natural gait pattern and without losing your balance. Waterproof - Leather/Mesh Dri-lex Lining. High Rebound EVA Midsole. Gel Pads Forefoot & Rearfoot Sizes: 8-14 - Widths: D, 2E, 4E