And you thought water skiing was cool. How about using that boat to drag you under the water instead? The Subwing ($700-$900) promises exactly that. Available in fiberglass, glossy carbon fiber, and matte carbon fiber models, the Subwing is actually two wings connected to a detachable center swivel, with rubber grip pads on each wing, a rear rubber triangle for one-handed use, and ropes that attach to the wings. All you need now is a diving mask — and a boat, of course. [Scouted by Chris]

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