Rottefella Xcelerator Skate spacer is an accessory for your Rottefella Xcelerator Skate bindings that lower the heel closer to the skis and thereby makes an angle that optimizes the position of the feet for skate cross-country skiing. The power transfer is optimized and you can optimize your training and races. Must be mounted on NIS mounting plates and thereafter you can mount your Rottefella Skate Xcelerator bindings on top.