Competence and performance in the field. The Cylinder™ II mountain bike shoe offers optimal comfort with the practicality and precision of a BOA® tightening system. With just a single adjustment and an adjustable front strap, you can slip into the shoes and hit the trail in no time. The BOA® L6 tightening system allows for 1 mm adjustment increments when putting on and features a macro release function to take off the shoe. The shaft construction provides excellent support and breathability, while our nylon co-molded sole with rubber® studs offers remarkable durability with reliable traction on almost any surface.