Rottefella NNN BC - Rottefella NNN BC norm touring bindings for skis and skates. - Manual function - Very sturdy and strong binging model for touring and Nordic skiing - Width: 56 mm - Only compatible with NNN BC boots: if the exposed iron bar at the tip of your boots is 42 mm wide, they are NNN BC boots. If they're narrower, your boots are not compatible with this binding. When ordering skis and these bindings in the same order, please tell us your boot size so our experts can mount the binding properly.