Yaktrax Run Traction Cleats for Running on Snow and Ice Traction cleats designed by runners specifically to fit over running shoes allowing users to continue training in winter Made of combination of replaceable, 3mm carbide-steel spikes and 1.4mm stainless-steel coils to provide unbeatable traction Provides 360 degrees of traction on cold surfaces for all-direction stability Rubber foot frame with formed-toe and over-foot straps secures the runners foot in the device; reflective heel and side straps for safety Tested safe from breakage in temperatures as low as -41 degrees F; available in S, M, L, and XL sizes to fit most shoes