Eyeline rubber long blade training fins help improve your kick strength, ankle flexibility and body position. 100% natural floating rubber foot pockets for comfort, true sizing and control. Soft pliable rubber design reduces foot and shin stress. Curved rigid rails extending from center foot to toe section preventing fin flex thus providing optimal propulsion for strong workout and training sessions, the curved rail sections reduce drag and allow optimal workout levels. Flexible foot pocket with easy grab on heel tab for faster on & off. Although the fins will be easier to place on your feet due to softer foot pockets and easy grab heel tab it is suggested you wet both the inside of the foot pockets and your own feet before attempting to place fins on.