Train hard, train smart in TYR Crossblade Fin 2.0. Engineered with an intermediate blade to promote increased tempo and speed through the legs when moving through the water, TYR Crossblade Fin 2.0 help swimmers to maintain the resistance necessary to build leg power and improve technique. With a 100% Natural Rubber construction and new thickened foot pockets, the Crossblade Fin 2.0 prevents athletes from feeling discomfort as they move. In addition to an innovative rounded edge design, each fin is also created with a universal, no-slip grip on the heel base. Fins are color coded by size for easy identification making them great for team style training sessions.XXS (Kid's Shoe 1-3) - OrangeXS (Men's Shoe 3-5, Women's 4.5-6.5) - GreenSM (Men's Shoe 5-7, Women's 6.5-8.5) - YellowMD (Men's Shoe 7-9, Women's 8.5-10.5) - RedLG (Men's Shoe 9-11, Women's 10.5-12.5) - BlackXL (Men's Shoe 11-13, Women's 12.5-14.5) - GreyXXL (Men's Shoe 13-15 , Women's 14.5+) - Blue