Designed for training, and made with comfort, the TYR® Stryker Swim Fins are a great addition to your training regimen. These adult fins are made with 100% silicone for a fit you’re sure to love! FEATURES: Designed for training Promotes a short, fast kick Creates the natural feel and flow of a flutter kick 100% silicone construction Comfortable feel and fit Short blade design SPECS: S (Men's Shoe 5-6 , Women's 6.5-7.5) M (Men's Shoe 6-7 , Women's 7.5-8.5) L (Men's Shoe 8-9 , Women's 9.5-10.5) XL (Men's Shoe 10-11 , Women's 11.5-12.5) XXL (Men's Shoe 12-13 , Women's 13.5-14.5)