Based on the original hydro fin, this old favorite offers high performance without breaking the bank. Hydro's patented V Rail Design creates more surface area to increase kick thrust. 100% Floating Rubber - incase you lose them in the water. V Rail Design for maximum speed and traction. Drain holes ensuring water & sand are quickly flushed. Contour Ankle strap designed to ensure maximum comfort. Perfect for body boarding and surf swimming. Hydro V Rail Design Designed to avoid the fin catching when bodyboarders ride in the dropknee position. Features 3 drain holes ensuring water & sand are quickly flushed. Contour Ankle strap designed to ensure maximum comfort.