The CRISPI® Skeleton Frame C.S.F. was born from the experience developed by the company in the Telemark skiing world, a field where CRISPI® is and has been world champion for years. The characteristics of a Telemark boot of the latest generation are maximum stability while twisting, together with a right and gradual foot bending: both these qualities are ideal for a trekking shoe. The C.S.F. system, thanks to two lateral containing supports allows the maximum torsional control ensuring however the best foot bending. The C.S.F. system achieves levels of performance usually reached by high altitude footwear with however much lower weight and more comfortable walking.