To buy and for more info: http://www.scuba.com/scuba-gear-22/113187/Seac-Seac-Shout-Full-Foot-Free-Diving-Fins.html

This demonstration video discusses and shows the features of the Seac Shout Full Foot Free Diving Fins. The fins are designed for free diving and spearfishing and are lightweight and powerful. The blade is made out of high elastic thermoplastic technopolymer. The Seac Shout features long blades to maximize thrust and minimizing work. The Free Diving fins have a comfortable full foot pocket. The blade angle is 22 degrees. Blade angle studied to obtain top performance with less effort. The Seac Shout Full Foot Free Diving Fins come in the colors black, green, and camo.