Want the stiff, powerful feel of a full fledged race boot, but don't necessarily want to shell out the cash' Take a closer look at the Rossignol X IUM Skate Boot. Designed and built for expert skiers that demand a powerful feel from their boots, the X IUM sports the same Xcelerator sole that can be found on Rossignol's World Cup skate boot for race worthy performance. In terms of support, the X IUM houses a 100% carbon cuff for better foreaft stability while keeping the total weight of the boot at a minimum. A plastic heel counter offers Active Control heel support, which works with the locking Speedlace system and the Lock Down foot wrap to deliver a secure and responsive fit. A precise fit is the single most important factor in ensuring comfortable feet during those long training days out on the Nordic track, so Rossignol integrated a thermo adjustable liner, so you get a fit that conforms to your own individual foot shape. Like all Rossignol boots, the X IUM Skate Boot is NNN compatible.