all-mountain snowboard boot for intermediate and advanced riders . the nidecker altai features a medium-stiff flex, making it ideal for all-mountain riders who enjoy high speeds and exploring the backcountry. the boa® system allows for quick adjustments, and when combined with the heat-moldable silver liner, it provides a secure and comfortable fit.outer bootthe lightweight gravity+ eva outsole provides excellent grip and cushioning for enhanced performance. the rubber backstay protects the rear of the boot from wear and ensures smooth entry and exit from bindings.inner bootthe heat-mouldable silver liner is 3d-moulded for superior comfort. 3d bars on the sides ensure optimal heel hold and prevent slipping. the asym-calf-collar further improves fit, delivering additional comfort and support.lacing systemthe altai features nidecker's dual boa® h4 coilerâ„¢ technology, which allows you to adjust the upper and lower zones of the boot independently for a snug fit.