Reflex SuperShell 4.0 for slalom has been designed to sustain the training of the water ski athlete. The front has been aerodynamically designed for hydrodynamic performances. The 840 release mechanism has arms constructed of stainless steel. The shape of the release arms have also been designed more vertically to keep the heel strongly connected to the plate. The 840 release is good for skiers who like to keep their rear foot big toe near of the heel of their front shell and is durable in salt and brackish waters. It features new additional tension settings.