Precision fit, rugged construction, and careful consideration to detail are embodied in the Powerline.   Packed with comfort enhancing features like an asymmetrical medial collar for added protection, an EVA midsole for increased stability, D3O insoles for amplified shock absorption, as well as a molded rubber toe cap, these are big-mountain, big-move, all-star shoes. Ride Concepts Powerline Flat Mtb Shoes Features Rubber Kinetics | DST 4.0 HIGH GRIP Rubber Outsole. D3O High Impact Zone Insole Technology. D3O Asymmetrical medial collar protection. Custom-molded rubber toe cap and heel protection. Medial high-rise EVA midsole provides support and shock absorption. Fully gusseted tongue prohibits intake of dirt and debris. Tech Fit.