The Alpina Pioneer Pro Xplore is a backcountry Nordic touring boot built for the Rottefella Xplore binding system, combining more downhill control with a better touring stride and a secure boot-binding connection. Features: Compatible only with the Rottefella Xplore binding Weighs 20% less than the regular Alpina Alaska BC Rotation point moved back close to the foot for a better stride SpringPin Technology reduces snow packing, adds comfort, stability and mobility, and makes stepping in and out easy Two-part anti-skid rubber sole Specifications: Size on this listing: EU 41