The Rossignol BC X3 Nordic Ski Boot is the go-anywhere do-anything boot for the skier who wants versatility. The B3 X3 Ski Boot goes with an NNN BC binding. It's burly enough to make your own trail through the woods or over a frozen lake but it's also light enough to use in track when you don't feel like putting in the extra work to break trail. The nylon lace cover means you don't have to thaw your boots in your car before untying them at the end of a long tour. Rossignol built the BC X3 Boots with a nylon midsole which offers a compromise between power and comfort. The boots are stiff enough to control the skis while you're turning and soft-flexing enough to be comfortable. Bottom Line: Rossignol's BC X3 Ski Boot is made for the person that equally skis in-track and off-trail.