SIZE CHART: XS: 35-37,suitable for length 21-21.5cm; S: 38-39,suitable for length 22-22.5cm; M:40-41,suitable for length 23-23.5cm; L: 42-43,suitable for length 24-24.5cm; Abrasion-resistant Neoprene Socks: With super durable material sole and toe area design, this pair of water socks durable than other traditional socks. You will not have these problems, such as seams ripped, do not last long, holes developed soon at toe area etc. Comfortable Fit, Breathable Socks: Fine workmanship with seamless glued inner socks layer never rubs against your toes or leads a blistered heel. Super soft, stretchy and breathable material for water and sand sports like: beach volleyball, beach soccer, diving, Rafting Sand-proof Beach Socks: Advance technology adopted, Glued and Blindstitched seam glues the neoprene together prevent micro sand getting into the socks. Anti-slip, Protect Your Feet from Hurt and Keep Warm: With anti-slip design on sole and warm thermal materials to protect your feet from hurt by rocks or other sharp objects and keep warm while underwater, 3mm diving socks can be worn together with booties or snorkel fins for protection or warm in cold water. Just enjoying your trip without worrying about losing body temperature or slipping down. Multi-purpose, for Men, Women, Unisex Water Socks: This pair of neoprene socks is perfect for various water sports like swimming, diving, snorkeling, paddle boarding, kiteboarding, wakeboarding, kayaking and other sports like beach soccer, beach volleyball.