Adjustable Straps & Quick Release BucklesOpen heel design and adjustable heel straps make the swim fins suitable for different foot types and sizes,There are two sizes for you to choose.The important part is the quick release buckle that is easy donning and doffing.Beneficial for quick escape. Open-toe Design & ComfortableOpen toe design to water flow out,soft comfortable foot pocket is more comfortable to free swim for adults.This design eliminates the need to worry about toes being bound by diving fins and do not rub against the toes.The foot cup is comfortable. Anti Slip & PortableEach fin has an anti-slip sole that supports better grip when you need it most,bionic keel designthickness decreases along the symmetry line for improved balance and stability.Light weight, small enough to pack.These travel size fins fit perfectly in your travel bag. Silicone Material & DurableMade of a soft, silicone for increased comfort. That's anti-deformation, lightweight, corrosion resistant and durability. Sturdy and maintains flexibility. So it can fully achieve the comfort level of barefoot wear and don't worry about rubbing feet.And snorkel fin that would accommodate water shoes with harder soles. 3D Fit DesignOur snorkel fins have soft silicone with rounded edges,comfortable fit without rubbing heel.The diving fins are designed according to people's feet.Adjustable length straps will make you more comfortable, adjusting according to the size of your feet and comfortable fit.