Optimal grip while runningWhen you run, you use the foot differently than walking, so we wanted to develop a ice grip that was suited specially for running. Nordic Grip Running fits perfectly on a running shoe, and has carefully researched placement of the spikes for the most efficient traction for the kick-off and movement when running. The grips work both on ice and snow, and let you run like freely even if it is winterPlacement of spikes is optimal for running-Fits perfectly on running shoes-Designed and produced for strength and endurance-Works as well on snow as on iceSizingSmall - Unisex (Men's US) 3-5, (EUR) 33-37Medium - Unisex (Men's US) 5-8, (EUR) 37-41Large - Unisex (Men's US) 8-12, (EUR) 41-45X-Large - Unisex (Men's US) 11-13, (EUR) 45-47