These pavement crampons are the best I have seen. Made from a tough stretchy rubber compound the Artimate Double traction snow grabbers have 6 hard carbon steel spikes at the front, similar to golf shoe spikes, and have a extremely tough wire spiral which crosses over at the back. The Artimates simply stretch over a pair of shoes or boots, you insert your toe into the hole in the rubber at the front and then stretch the back over your heel, a little re-adjustment and your done. They really work extremely well and give confidence on slippery surfaces like pavements and school playgrounds. A very cost effective way to stay upright and safe this winter. Very similar to Petzl Spikey Plus Product Features * 6 spikes on each side. * Carbide steel wire lasts longer than regular steel. * Made of Thermoplastic Elastomer. * Material is flexible to -40 C. * Special stretch rubber retains elasticity and fit. * FIts shoe sizes UK 6 - 9