Nidecker Ranger Boa Boots black 2019/20 Specifications FlowFIT - a combination of Nidecker and Flow knowledge and experience with technologies like BOA guarantees the best fit boots with a perfect balance of comfort, support and control Boa M1 Closure System - a 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 EVA foam insole. Moisture Wicking Articulating Flex Zone