The TREX 6300TC Tungsten Carbide Slip-On Ice Cleats are lightweight ice grips for boots and shoes that provide tenacious traction and extra stability on ice and snow. One-piece design offers grip to prevent slip and fall injuries on the ice. These ice grippers feature eight rugged tungsten carbide cleats on the ball and heel of foot for extra-firm grip on slippery terrain. Tungsten Carbide is a very hard compound. It rates 9 on the Mohs scale for hardness, second only to a diamond. Because it is so hard, the spike can be thinner, providing better penetration and sharper grip. These will fit over any style of boot or shoe for traction and stability during winter work or other winter outdoor activities. Tested to be flexible in temperatures down to -40°F (-40°C), the stretchable rubber material provides a secure fit and easy slip on\/off wear. These snow cleats are lightweight and can be folded small enough to be stored in a pocket or pack when not being worn.