Head Supershape e-Rally Snow Skis with Protector Bindings 2023132 78 114 Sidecut radius = 14. 0 meters (170 cm) e Rally is the hallmark, best known model in the SuperShape E series. Built like Head's World Cup race skis inside, but with a smidge of tip rocker (called Speed Rocker) to help the ski hook up quickly when tipped on edge, and to also smooth our the rolls and bumps a bit as conditions go from groomed to afternoon crud. Inside the ski, Head's proprietary Energy Management Circuit sets these skis aside