OTX or "Off-Track Cross Country"these boots are made for exploring new terrain, beyond maintained tracks. The warm structure and tall shaft are also suitable for light backcountry use. The cuff is equipped with a short gaiter. Unlike regular classic boots, the OTX Adventure features an articulated ankle support. This improves ski control, especially on descents. - NNN BC compatible (not standard NNN, Prolink, or Turnamic) - Roomier Comfort Fit last - Comfort Guard insulation - Reinforced toe area - Pull loop for easy on and off - Drawstring closure at the top of the shaft - 3D Cuff ankle support