Train hard, train smart in TYR Burner Fins 2. 0. Engineered to promote short, quick movement through the legs and the feet, LFBP2 fins help swimmers to provide the propulsion necessary to enhance stroke technique. With a 100% Natural Rubber construction and new thickened foot pockets, the Burner Fin 2. 0 prevents athletes from feeling discomfort as they move. In addition to an innovative rounded edge design, each fin is also created with a universal, no-slip grip on the heel base.