Rossignol Sin 7 Free Skis (2014) - Men's The all-new SIN 7 delivers a revolutionary fusion of backcountry, freestyle and freeride performance Powder Turn Rocker: A profile with 50% standard camber in the center of the ski and 50% rocker at the tip and tail. The slight underfoot camber makes the skis grippy on groomed trails. The tail rocker gives better steering and control. Air Tip technology: The tip is filled with air for maximum lightness and built to retain maximum torsional rigidity. The ski's weight is redistributed, the tip is lightened for greater ease, safety and versatility, and the weight is focused in the center of the ski to maximize control and power beneath the skier's feet Sidewalls are angled at 30 to reduce inertia and overall weight while improving grip 70% powder, 30% all-mountain