Breathable mesh upper provides ventilation and quick drying. Nylon-based mesh made from 40% recycled ocean plastics. Ultra-lightweightGRANDFØAM footbed absorbs shock and provides rebound with each step. Tidalflow™ water drainage system accelerates water removal to keep feet dry. Anchortrac™ outsole is designed for maximum traction in both wet and dry environments. For an average to shallow instep, consider sizing down ½ size as this is a full-fitting style. Style #W27189 More reasons to love it