X-6 from Rossignol are classic boots for cross country skiing as well as roller skiing.
These boots are a good choice for fitness-oriented skiers - it covers a lot of nice features to provide a good fit and precise power transfer.
The boots have the Lock Down design that ensures a good narrow wrap around the feet and the Active Control enhances good heel hold so you don't lose energy. Also, it is possible to heat mold the boot to further enhance personal fit if you feel the need for it.
The asymmetrical lacing provides good comfortable fit and control.