100% SyntheticRubber soleRecommended 1: CONVENIENCE - Smooth neck design prevents chafing when wearing our water shoes. It is convenient to wear and take off.Recommended 2: COMFORTABLE FIT -- Breathable and smooth fabrics with fine stretch on uppers. Like socks, flexible and comfortable.Recommended 3: RUBBER OUTSOLE & FOOT SAFETY -- Wearable and top-quality rubber sole, which protects your feet from being hurt by sharp objects.Recommended 4: OCCASION - Yoga Training, beach, swimming, pool, weight training, wake-boarding, sailing, boating, kayaking, windsurfing, cycling, jogging, walking, fishing, beach volleyball, gardening, lawn, car-washing and driving. Family outings!TipsVARIOUS SIZE AVAILABLE -- fit different feet,little kids, big kids,men,women are available.