Happy Moose Ice Traction Trekkers have carbon steel 15mm spikes that grip ice and packed snow with ease. The special designed hinged front plate flexes with the sole as you walk, for improved grip. Easily pulled over your shoe or boot, the Ice Traction Trekkers remain securely in place until you are ready to remove them. Included are fastening velcro straps that go over-shoe to provide improved fit and more stability. Walking on snow-covered and icy surfaces just became a little easier. The stretchable body of the Ice Traction Trekkers is made of a silicon elastomer, which has been tested to up to -40 C. Each Ice Traction Trekker has 13 heat treated carbon steel spikes and a stainless-steel chain. A handy clamshell storage case is included. Caution: While Happy Moose Ice Traction Trekkers can improve traction in many outdoor winter conditions such as snow and ice, Happy Moose Ice Traction Trekkers cannot prevent all slips and falls. Happy Moose Ice Traction Trekkers should not be used for rock climbing, climbing ladders, indoor use or while driving. Please use extreme caution when walking on polished or hard surfaces such as granite, marble, polished steel or stone. Always use caution when walking on slippery surfaces. Included: One Pair of Happy Moose Ice Traction Trekkers, Two Velcro straps, One Clamshell Case.