Zonal BOA Performance. RIDE fit.The Octave is a mid flexing all mountain boot designed for comfort and performance. The Zonal BOA Fit System allows you to tighten the upper and lower sections of the boot independently. Lets break this down- When you pull the liner lace, its actually going to pull the the top of the boot tight while securing the tongue of the boot over your foot and pushing your heel into the heel pocket. Stop reading and start buying. We promise, youll love the Octave.