all-mountain boot for advanced riders . the nidecker altai comes with a hard flex, making it ideal for all-mountain riders who like high speeds and want to explore the backcountry. the boa® system can be adjusted in seconds and, in conjunction with the 3d-moulded liner, ensures a perfect fit.outer bootthe altai comes with the robust b.f.t. gravity 2.0 rubber outsole. this sole not only provides grip, it also supports your foot anatomy and offers n-gel cushioning for buttery soft landings.linerthe silver heat moldable liner is 3d-molded and super-comfortable. j-bars on the sides provide the best heel hold and prevent slipping in the boot. in addition, an asym calf collar offers even better fit and thus comfort and support.lacing systemwith the altain, nidecker use the h4 coilerâ„¢ technology. for you, this means that you can adjust the different zones of your boot separately and thus enjoy an optimal fit.