Are you into trail running, hiking or fastpacking and looking for a lightweight, reliable and comfortable option when moving across as well as up and down mountains? Then the Trail Crampon Ultras are your choice. They are used by athletes as well as outdoor enthusiasts and give you the confidence to focus on your performance and experience rather than worrying whether or not your next step will be a slippery one! These crampons are US Patented and built to last - covered by a two year limited warranty. Features: Versatile: Can be combined with trail running shoes, hiking shoes, hiking boots and insulated boots Reliable & durable: Grip on packed snow and ice (up hill and down hill) enabled by 18 stainless steel spikes including three 2/3 inch spikes on the heel. Also equipped with double link side chains, steel toe bail and high quality elastomer harness Secure fit: Velcro strap across the foot Carry bag included: A convenient puncture-proof carry bag for storage before & after your adventure Specs: Materials Stainless steel spikes Stainless steel chains (double link sides) Stainless steel toe bail Elastomer harness Weight 14.25 oz | 422 g (pair) Spikes Length: 1/2" - 2/3" | 1.2 - 1.5 cm Number of spikes: 18 Recommended use: Trail Running Hiking / Backpacking Fastpacking This product fits: Trail Runners Hiking Shoes(flexible soles) Hiking Boots(rigid soles) Insulated Boots(winter boots, waders, etc)