From cutting the different layers to the choice of the wood core inside, everything in this full-carbon, high-modulus 12k mast is scientifically designed to put you in front of the fleet. The 645 wing has all the great characteristics of the 637 with its thin section profile and light reverse gullwing design. A lowered aspect ratio gives that extra lift for light-wind days. The increased arc and twisted tips reduce the ventilation when the wing comes out of the water during radical upwind course. All this makes for an easy ride and extreme control at the highest speed.