Multiple size options: S-M, L-XL. Adjustable Strap and BuckleThe open heel design and adjustable strap make the fins fit different foot shapes and sizes, perfect for sharing with your friends and family, plus it keeps small pebbles and debris out. The important part is the quick release buckle, which keeps the strap length you set, so you don't need to adjust the strap every time you use it, easy to put on and take off. Perfect Swimming PartnerSnorkel fins are scientifically designed to minimize fatigue and prevent cramps, it features a unique open toe and cool flame-shaped mesh instep design, which helps reduce resistance and make you feel more comfortable and breathable . It can be used with water shoes and water socks (reminder: if wearing with diving boots, please buy a size up). Reliable MaterialTPR material foot pocket + PC buckle + PP blade. That is, deformation resistance, light weight, corrosion resistance and durability. Be strong and stay flexible. So it can fully achieve the comfort of wearing bare feet without worrying about rubbing your feet. Anti-skid shadow design at the bottom, safe to use. Suitable for TravelingPay attention to every detail, we provide quick-drying mesh bag and hard plastic insert for the fins, the mesh bag can quickly filter sand and water, it and short flippers are very suitable for travel and travel. Hard plastic keeps fins in shape when stored.