Designed by runners, for runners, the Yaktrax Run ice traction cleats feature 3mm carbide steel spikes for reliable toe-off, and 1.4 mm steel coils for flexible landing on the heel. With 360 degrees of unbeatable traction, you will run naturally on packed snow and ice. MADE OF HIGH STRENGTH NATURAL RUBBER - 1.4 MM STEEL COILS - CARBIDE STEEL SPIKES - REFLECTIVE HEEL TAB AND PERFORMANCE - STRAP OFFERS SAFETY - ANATOMIC RIGHT/LEFT DESIGN