• Interior material: 90% polyester + 10% elastane. Beach shoes have good moisture resistance, so the shoe dries quickly. Soft fabrics with fine elastic on top. Like socks. • Sole: The sole of this swim shoe is made of non-slip rubber. The outer sole of spandex with small ventilation holes dries quickly and makes surf shoes soft and elastic. Non-slip and durable so you can play in the water, gym, and beach. • Heel shape: flat sole. These swim shoes offer optimal protection against sharp objects such as stones, sea urchins, and shells. The perfect material for water shoes makes it easy to put on and take off. • Material composition: neoprene + rubber + polyester + elastane, soft and comfortable.