Rossignol SAS Sensor3 110 Ski Boots 2010: The 2010 Rossignol SAS Sensor3 110 Ski Boots are true performers whether you are in the backcountry or the park. This new high powered freestyle ski boot is for aggressive skiers that seek ultimate sensitivity and fit. With a medium flex for freedom of movement, stomping that backcountry cork 9 will be as easy almost as getting off the chairlift in the Rossignol SAS Sensor3 110 Ski Boots.