Features: Make of Silicone material, soft and comfortable, light weights and durability. Sturdys and maintains flexibility. Antislip pattern, highly frictions, stable and not easy to slip. The wide Fins, providing strong power, ensuring good kicking frequency and stable propulsions. Ergonomical, comfortable to wear. Full foot wrap, not easy to come down. The diversions port can guide the direction of water flows, quickly drain and reduce resistance. Specifications: Material: Silicone Size: XS/Small/Medium/L/Extras Large Size:XS Suggested Shoe Size:30-32 External Length:27cm(10.63inch) Internal Length:13.50cm(5.31inch) Size:S Suggested Shoe Size:33-35 External Length:28cm(11.02inch) Internal Length:14cm(5.51inch) Size:M Suggested Shoe Size:36-38 External Length:30cm(11.81inch) Internal Length:15.0cm(5.91inch) Size:L Suggested Shoe Size:39-41 External Length:33.50cm(13.19inch) Internal Length:16.50cm(6.50inch) Size:XL Suggested Shoe Size:42-44 External Length:36cm(14.17inch) Internal Length:18cm(7.09inch) Package Includes: 1pair Snorkels Fins note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.