70 Flex Index: This boot has a flex rating of 70, which is best suited for beginner and intermediate skiers. Softer boots will be more comfortable, but won't offer enough stability at higher speeds. Stiffer than 70 will give that stability, but start to get a little less comfortable.
Excenter Canting Rivet: Canting on the outside of the boot and a pivot on the inside gives the skier control over the left and right angle of the leg to correct for knock-kneedness or bowleggednesss
Micro-adjustable aluminum buckles: These aluminum buckles can be moved to adjust for size, so if the default position of the buckle and the teeth is too wide or too narrow, you can move it until it fits.
35mm strap: Wider than average strap at the top of the boot to help keep the boot together and to give good performance while skiing.
Full Thermo Fit Liner: Body heat activates the material in this liner to shape to the skier's foot faster than a standard liner. The insulation also has heat reflective properties to keep the warm in, and the cold out.
Macro adjust ladder (SuperMacro): The tooth plate opposite the top buckles can be moved in or out for a huge range of adjustment, and to fit narrow to wide lower legs.
Tongue Pull: A loop of fabric at the top of the tongue helps in putting on and removing the boots. Pull it forward and to the side and your foot should slide right in.
Woman Specific Cuff/Liner design: This boot has a shorter cuff and a wider calf area, which are features that make this boot easier to put on and more comfortable on (most) women's feet than a unisex boot.
One Piece Toebox: The solid one piece toebox is integrated into the liner to prevent deformation when putting on or taking off the boot, as well as eliminating any pressure points caused by liner seams.
Diagonal Buckles: Rossignol has patented their diagonal buckle design, which are both easier to clamp down, and pull your foot back into the boot as opposed to just pressing your foot into the footboard.
SensorFit Technology: Rossignol's Sensor boots are anatomically designed to have direct contact with the foot's 'balance receptor points' (big toe, little toe, heel) to give a comfortable fit as well as greater power that comes from greater balance. Additionally, Sensor fit boots have a seamless, one piece tongue and a cushy instep pocket too, both of which are there to minimize pressure points no matter how tight you lock down your buckles.