The perfect warm weather partner the keen whisper women's walking sandals feature technologies that make water filled days supremely comfortable with its washable polyester webbing upper & cmeva (compression molded ethyl vinyl acetate) midsole meaning the sandals feel comfortable & supportive in the upper & cushioned & protected underfoot. Added to this a lace capture system which allows for a comfortable & secure fit & you have a sandal that is a must have for any warm day filled with both water & land based activities. For added comfort & support, keen employ hybrid-ology in the form of a metatomical eva footbed. This is an anatomically designed internal support mechanism which provides support for the arch & metatarsals & cradles the natural contours of the foot. Metatarsals + anatomical = metatomical. Enhanced traction underfoot is achieved through a multi-directional lug pattern on the outsole which ensures you stay stable over rough terrain or or wet rocks.