SIZE CHART: S/MD(KIDS SIZE): US JR9-13, EU26-31, JP15.5-19.5,total length 16.74in/42.5cm, fin width 7.85in/20cm, fin length 9.2in/23.5cm; S/M:US4.5-8.5, EU36-41, JP22-25, total length 17.58in/44.6cm, fin width 7.85in/20cm, fin length 9.45in/24cm; ML/XL: US9-13, EU42-47, JP26-29, total length 7.78in/45cm, fin width 7.85in/20cm, fin length 9.6in/24.5cm; Product introduction: High-grade fins, scientific and reasonable design, synthetic rubber and plastic material, good toughness, biological simulation effect, easy to use, with a special transparent bag, easy to carry. The size can be adjusted freely for a wide range of fit. Great for swimming! Can greatly improve swimming speed. Tools for diving enthusiasts! Product material: PP+TPR [Advantages]: The compound rubber composition is sufficient; the new design, the design of the middle seconds reduces the weight, and the design of the middle increases the flexibility of these thick fins, which makes the water shooting process generate more forward propulsion, At the same time, it avoids the situation that divers with insufficient leg strength are prone to foot cramps. [Features of the fins]: The new composite material, excellent propulsion efficiency and continuous fast propulsion, strengthen the design of the new style guide wings on the fin surface, and fully support the comfortable and soft foot pockets of the feet. Good material, soft touch, comfortable foot feel, environmentally friendly and non-toxic. The overall softness and toughness are strong, avoiding the danger of being easily broken. The price is lower than that of many styles year-on-year, high quality and low price, Suitable for general tourism and snorkeling, The swimming effect is good, and it is a tool for diving enthusiasts! Instructions for use: Fins are an auxiliary tool for speed increase, resistance reduction and propulsion for swimming and diving. The slip-on fins wrap the entire sole of the foot with a foot cover. Foot fins are softer when snorkeling, which can reduce lifting the fins out of the water.