A Great Fin Designed for Small Feet The versatile DOLPHIN fin features an open heel design for snorkelers who like to wear neoprene boots. The fin is easy to don and doff, with a foot pocket so soft and supportive you can easily use the fin barefoot. The DOLPHIN is available in 2 sizes in a choice of colors. Available Sizes: S/M (28-31), L/XL (32-34). Colors: Green, Yellow, Blue.