Ergodyne TREX 6310 Adjustable Traction Cleat Grips Ice and Snow, One-Piece Easily Attaches Over Shoe/Boot with Carbon Steel Spikes to Provide Anti-Slip Solution, Medium REDUCE RISK OF FALLS AND INJURY Rugged 10 carbon steel cleats on ball and heel of foot grip slippery terrain and increase stability while walking, hiking, or running on snow and ice. DURABLE FLEXIBILITY Tested to remain flexible in temps up to -40F (-40C). Stretchable rubber construction won't break in cold temperatures providing reliable everyday traction. SECURE COMFORTABLE FIT Made with stetchable rubber material for easy slip on and adjustable cinch cord for snug fit. UNIVERSAL WEAR Versatile traction cleat is available in multiple sizes and fits over any boot or shoe for tenacious grip, stabilizing wearers during any winter outdoor activity. LIGHTWEIGHT AND PORTABLE Material is lightweight and can be folded small enough to be stored in a pocket or pack when not being worn. REPLACEMENT STUDS AVAILABLE Sold Separately. TREX 6301 Replacement Studs includes a package of 8 heat-treated carbon steel replacement spikes. Easily pop the old ones out and the new ones in for continued use throughout the seasons