Rubber sole Quick dry, cozy to wear, lightweight, portable for travel, non-slip. Premium material neoprene, super stretchy for a comfortable fit. Improved sole to reduce the worn and enhance slip resistance. Wear together with wetsuit boots for added warmth in very cold water and prevent your toe from rubbing. Also great for walking on hot sand and rough concrete. Occasion: Beach, swimming pool, swimming, snorkeling, diving, water aerobics and other water sports. Size: S: 6-7 / M: 8-9 / L: 10 -11, unisex.