Perfect for AllSwim fins is design for swimming training. It is great swim gear to improve leg strength, speed and endurance. It's perfect for amateur swimmers even professional. BenefitThe internal length is 2/3 of the total length, the design can reduce drag.Increasing dynamics of push the water and a better balance. MaterialTPR+PP material, soft foot pocket, flexible enough for barefoot, can also be worn with fin socks or dive booties which help to protect a diver's feet from the cold, and blisters. Anti-slip FlippersAnti-slip design of flipper bottom,it can prevent slip,sprain and scratch,apprain and scratch.Assure your safety at the most extent. PortableCompact Size, Perfect for Travellingmaking it ideal for packing with ease. And it is a useful swimming aid either for pool or sea swim-lovers or snorkelers. Colour:Blue | Size:M(40-41) DESCRIPTION It increase kick resistance so as to improve strength of legs and flexibility of ankle. Hard aircraft tail wing design has a strong propulsion, and full foot pockets is made from soft silicone, reliable and comfortable during swimming training and swimmingrecreations. SPECIFICATION: Color: Blue Size:M Material: TPR+PP Weight:750-850g Type:Diving fins,Slippers PAKAGE LIST: 1* Swim fins REMINDER: Please purchase sizes up if wear with dive booties together