Slip Resistant Outsole Drainage holes throughout to help with water Textured footbed for added traction and secure fit Care Instructions: Shrinkage and warping may occur if exposed to high heat or cold temperatures. Clean by hand with lukewarm water. Wear, store, and air dry in moderate temperatures. Do not place in washing machine or dishwasher. The all new Xtratuf Riptide is a one-piece injection . BioLite slip-on sneaker. Built for life on and off the boat, the Riptide is non-marking and slip resisting. With drainage holes throughout the upper, this shoe is made for all day wear wherever you go. The Riptide is available in adult sizing (Men's 9 = Women's 11).