- Made from environmental material phthalate and formaldehyde free EVA foam. Healthy, not easy to deform and perfect waterproof. Lightweight and portable to take it on your trips! Double hot-press molding technical process with textured grain surface, a good compromise between hardness and comfort. A-shaped streamline, special grip position and ergonomic handshake, glide smoothly when swimming in the water with less obstruction and also anti-slip. Good buoyancy, suitable for casual and regular swimmers, allow you to exercise your lower extremities (buttocks, thighs, calves and core muscles) by kicking. Shark fin shape head, conducive to the flow of water, shape is more beautiful.