Salming Adder Ladies Indoor Court Shoes Synthetic The Salming Adder is greatly inspired by the success of Salming's Viper shoes in many respects. RollBar: An increased radius on the inner side of the outer sole, facilitates rolling the foot inwards and toe push off. T.G.S. 62/75 (Torsion Guide System): The distance from heel to the ball of the foot has been designed with extra stability, which ends in the "ballet" line. In front of this line Salming has equipped the shoe with greater flexibility to stimulate the foot's natural movements ExoSkeleton: The exo skeleton design stabilizes the foot for lateral movements and reduces pressure at the Metatarsophalangeal joints XR110: The outsole has an extra sticky compound to maximize performance on any indoor court