Abstract: A snow ski has a longitudinal body defining a sole for gliding on the snow. The ski includes: (a) a platform slidably coupled to the body for sliding longitudinally relative to the body; and (b) a gripping element slidably and rotatably coupled to the body and rotatably coupled to the platform. The gripping element extends downward to penetrate the snow in response to the platform being slid rearward relative to the body. The gripping element retracts upward above the sole when the platform is slid forward relative to the body. First and second gripping elements may be disposed on opposing sides of the body. A locking mechanism selectively locks the platform at a forward position, in which the gripping element is retracted, one or more intermediate positions, or a rearward position in which the gripping element extends to penetrate the snow. A ski-traction kit for retrofitting a ski is provided.

Abstract: A snow ski has a longitudinal body defining a sole for gliding on the snow. The ski includes: (a) a platform slidably coupled to the body for sliding longitudinally relative to the body; and (b) a gripping element slidably and rotatably coupled to the body and rotatably coupled to the platform. The gripping element extends downward to penetrate the snow in response to the platform being slid rearward relative to the body. The gripping element retracts upward above the sole when the platform is slid forward relative to the body. First and second gripping elements may be disposed on opposing sides of the body. A locking mechanism selectively locks the platform at a forward position, in which the gripping element is retracted, one or more intermediate positions, or a rearward position in which the gripping element extends to penetrate the snow. A ski-traction kit for retrofitting a ski is provided.