This is the Rob Allen Scorpia Fins Plastic Long Blade Spearfishing Fins Features: One of the best fitting, most durable freediving fins available today Moulded rubber foot pocket, engineered to prevent over flexing, meaning superior transmission of leg energy to the fin blade Purpose softened blade with channels for optimum water transferal The fins come in the following sizes: XS (Men&';s U.S 4-5)Small (Men&';s U.S 6-7) , Medium (Men&';s U.S 8-9) , Large (Men&';s U.S 10-11) , XLarge (Men&';s U.S 12-13) , XXLarge (Men&';s U.S 14-15) ***Sizes are based upon using a freediving sock. If you don&';t plan on using a dive sock, it is recommended to order one size down. Rob Allen plastic fins are extremely economical and are suited to the beginner and predominantly shore diver. They are extremely robust and are able to stand up to the heavy demands shore diving places on fins.