Step into a revolution — the easy entry and high performance revolution of our innovative Step In design. Made for skiers looking for a medium-volume fit and performance flex, the women's Rossignol Vizion 4B Pro 90 ski boots feature a ground-breaking overlap shell design that opens wide in the back for unparalleled slip-on ease thanks to an innovative spoiler and spine mechanism. The system creates wide articulation at the cuff and complete locked-in support for precise power transfer and full downhill performance with unmatched ease of use. Just slip in, buckle up and ski. Medium-Volume Fit Medium-Volume fit features a 100mm last for a performance feel that balances comfort and control Slip-On Ease, Full Alpine Performance Step In technology is a revolutionary new overlap boot design that delivers the highest levels of ski performance with first-of-its-kind, hands-free entry and exit Locked-In Performance Our Spine Link Mechanism is the magic that makes Vizion the easiest entry and exit alpine boots on the market. When locked, the mechanism holds the Steel Spine in a traditional ski position. When released, it allows the boot to open wide for slipper-like entry and exit. Full Support, Easy Entry The Bi-Injected Spoiler features rigid PU material for the support and energy transmission of a traditional alpine boot, while its soft rubber sides wrap to form a tight seal. Extended backwards articulation makes for incredibly easy boot entry and exit. Easy-Open Cuff A unique Double Buckle on the lower cuff effortlessly unlocks and releases the spoiler for smooth, slipper-like entry and exit Better Skiability, Better Fit Dual Core technology provides targeted power transmission and shell wrapping, resulting in livelier rebound, response and control Full Custom Comfort, Easy Entry, Full Support Our True Form Step-In Liner offers the fit and feel of a traditional custom fit alpine liner with key features that allow wide access for easy entry and exit while retaining the support needed for aggressive skiing. Insulated Warmth and Support Thinsulate™ Stretch insulates while providing enhanced foot support for better skiability Optimized Fit and Warmth Our Seamless Toe Box eliminates pressure points for optimized out-of-the-box fit and reduces heat loss by 20% All-Terrain Grip Pre-mounted GripWalk® soles feature a rubber tread and rockered toe for a more natural walking motion and increased traction