4.25" Thruster set for surfers under 150 lbs.
4.50" Thruster set for surfers over 140 lbs.
Will fit FCS, Future and Lokbox fin systems.
Proteck fins are SOFT EDGE to protect you from fin cuts and injuries but you still getting the same performance or better. Power Flex is a Pro Teck Fin with a medium core flex. The fin bends on turns, and then springs back, creating a forward thrust similar to a swim fin. The medium flex core and flexible training edge makes the board turn smooth and fluid with continuous speed. Power Flex Tri Fin Set