The backcountry version of the NNN binding stands up to harder use and more aggressive turns. Durable, and simple to use ideal for backcountry conditions. Step in design releases with a prod from your ski pole tip. For use only with NNN BC compatible backcountry ski boots. Dual ridges align with grooves on NNN BC boots for greater foot down control. Recommended boots include the Alpina BC 1550. Skis and bindings are shipped unmounted and unadjusted. Skis, boots and bindings including track mounted bindings must be installed, adjusted and tested as a complete system by a qualified ski technician prior to use. Please contact our Customer Service Department at 888.463.6367 for help locating one of our stores that can perform the mounting service..