The X-10 boot from Rossignol is for classic cross country skiing. It's a boot designed for race, competition and high performance. It's a Rossignol boot for competitive and expert skiers. It's torsional rigid for good power transfer with speedlace lock securing a good and quick fit with a narrow heel fit due to the Active Control heel support. It comes with a heat-moldable liner for a customized fit. The boot is compatible with NNN and Salomon Prolink bindings.