The heart of the KTS Crampon is the Leafspring Flex Bar which maintains the flexibility of the footwear whilst adding traction. It is constructed from ultra-thin multiple layers of hardened stainless steel that reduces stress & provides an even “normal” flex that will last a lifetime. The independent front & rear binding system is simple to adjust & will fit virtually all types of footwear. Ten 25mm spikes provide superb traction & the two sections of the KTS slide together along the Leafspring Flex Bar bar to reduce their pack size. We recommend the use of KTS SRS anti-balling plates with these crampons to reduce the build up of snow, especially in soft mushy conditions. 4130 Chromoly Steel construction Ten 25mm spikes 3 year warranty Lifetime warranty on Leafspring Flex Bar