Product Specifications Hardness: Heel: 50 degrees, Blade: 70 degree (Silicone on the heel is soft). Size: XS: 7.9 - 8.7 inches (20.0 - 22.0 cm) (4-5) S: 8.9 - 9.6 inches (22.5 - 24.5 cm) (6 - 7) = Height 13.0 inches (33 x 18.5 cm). M: 9.8 - 10.4 inches (25.0 - 26.5 cm) (8 - 9) = Height 13.8 inches (35 x 19.5 cm). ML: 9-10 (27.0-28.0 cm) = Height 13.8 inches (35 cm) x Width 8.1 inches (20.5 cm). L: 11.2 - 11.8 inches (28.5 - 30.0 cm) (10 - 11) = Height 14.6 inches (37 x 21.5 cm). Material: Special silicone (T-Form) Country of Origin: China. [Product Details] This gentleness changes to strength. We have added an improvement to the traditional hard type and bring out the potential as a power fin. Also great for challenging dolphin kick strengthening practices. Recommended for speed training and high-level kick strength. Simply float in water, light and easy to use, this is not a fin for easy swimming. For swimmers who want serious kick power. In training fins, the most endurance and leg strength resistance and potential The Tech 2 Fin SWIM is the Fins that you can recolor your training scene. ...