Omer Stingray Winter Fins The Omer Stingray Winter Fins with removable blades do mainly have two characteristics: their thermo rubber foot pocket and an angle of 22 degrees between the foot pocket and the blade. Traditionally the angle is between 15 and 17 degrees). The foot pockets of the Omer Stingray Winter Fins offers more comfort than the common foot pockets, due to the thermo rubber made out of two different hardness compounds. The special angle of 22 degrees is a result of the optimizing process in order to develop the best results for the most effective push relatively to the effort. The Omer Stingray Winter Fins are available in gray and soft stiffness.