It uses a mesh,waterproof upper that is extremely snug fitting and a 3 layer construction that provides: comfort, thanks to the seamless construction, flexibility and structure thanks to the innovative MicroLite Skeleton™ that follows the natural movement of the foot when running, protection thanks to the Flex-Guard™ inserts that offer a lightweight barrier against abrasion during rocks and roots while running. Exceptional stability is provided thanks to the TrailCage System™ which is placed between the two layers of the uppers to give structure and a snug fit, and is fully integrated with the lacing system. The outsole has been developed by the La Sportiva R&D department and uses the grippy FriXion XT with Impact Brake System and an exclusive design with Trail Rocker technology to facilitate “external heel –internal toe” motion while running.Shock absorbing, protection and comfort, 3 layers in perfect geometry: origami inspires the overall design of the boot. With Akyra, winter running is an art.