The Waterpro Ultra Sport is part of Continuum Aqua Sport Collection from Merrell. It is designed for those frequently in and around still moving or wild water who need high-function footwear that can stand up to the rinse cycle. Features include slip lasted construction. Synthetic leather/ventilated mesh upper. Micro mesh free flowing drainage ports. Injection molded TPU rearfoot stabilizer. Free floating heel/dynamic lacing system. Hydro drainage/antimicrobial ventilated footbed with Etc anti-friction lining. Injection molded TPU toe bumper/integrated drainage ports. Nylon 6.6 injection molded arch shank. In-Board compression molded EVA footframe. Q-Form alignment system. Air Cushion midsole. Water friendly non-marking/razor-cut siped sole. 3.5mm sole lug depth and Vibram RinseMaster sole/trek rubber.