OMER Stingray Freediving, Spearfishing Full Foot Pocket Long Blade Fins OMER Stingray Freediving, Spearfishing Full Foot Pocket Long Blade Fins Fixed blade fins, Characterized by their thermo rubber foot-pocket 22 degree angle between foot-pocket and blade (compared to traditional 15/17 degree) The 22 degree angle is the result of trying to optimize the power of the push through the water relative to effort