SEAC Shout S1000 Diving Fins Composite full foot, non-vented, hard blade fin for spear fishing and free diving is very flexible and comfortable to wear over prolonged use Blade angle designed at an anatomically correct 22-degrees for superior performance with less effort Comfortable open-toe design with foot pocket molded from thermoplastic elastomer; wear with or without neoprene socks or diving boots Side rails and ribs reduce water spilling over blade edges during the kick, improving kick efficiency, thrust, and power Different sizes fit men and women over a wide range from men's US sizing 6 to 15; Color: Black