Acorn Oh Ewe II - A new generation slipper with all the benefits of classic comfort. Double-face sheepskin uppers in a slip-on design, for no-hassle on/off wear. Sheepskin collar and linings are hypoallergenic, biodegradable and wick away moisture. Contoured and molded polyurethane footbed offers enhanced heel and arch support. Memory foam midsole on a layer of EVA provides lightweight shock absorption. Weatherproof, rubber outsole with non-skid tread for added grip and traction..