Summer footwear typically consists of SANDALS, thongs, and waterskis. SANDALS are open-toed shoes with straps that go around the foot and ankle, usually made of leather or rubber. Thongs are similar to SANDALS but have a single strap between the toes and a heel strap. Waterskis are a type of shoe designed for use in water sports, such as swimming, surfing, and wakeboarding. They are usually made of neoprene or other waterproof material and feature a sole with grip to provide traction on wet surfaces.