The Yaktrax Run ice traction cleats are designed for runners, by runners. Run naturally on packed snow and ice with the Yaktrax Run s combination of 3mm carbide steel spikes for reliable toe-off and 1.4mm steel coils for flexible landing on the heel, providing 360 of unbeatable traction. Continue your training during the winter as you would in any other season. The Yaktrax Run can be worn in temperatures as low as -41 Fahrenheit. For oversized shoes or boots, Yaktrax recommends purchasing one size larger than your normal shoe size.