UFO is a good choice for riders that prefer durable, aggressive, all-mountain boots. UFO combines the power of Endo Construction, BOA Conda liner closure and the K2 Double BOA Lacing system. Endo Construction is based on a urethane endoskeletal structure that focuses the flex into a single part as opposed to stressing synthetic leather and stitch lines to get flex. UFO also includes a Intuition Pro Foam 3D liner, new Vibram Pro Light Sole with Harshmellow, 3D Formed Dual Density EVA footbed also with Harshmellow, and Moldable Internal J Bars with Velcro Pod Closure in the liner fit.