Nidecker Ranger Boa Boots charcoal 2018/19 Parameters FlowFIT - Combining Nidecker and Flow knowledge and experience with technologies like BOA ensures the best fit boots with a perfect balance of comfort, support and control. Boa M1 Closure System - popular fastening system. Use the handwheel to tighten the shoe as you need it, quickly and easily. 3D-molded Single-Density Insole - soft, anatomically shaped insole made of EVA foam. Articulating Flex