The Lange RX 90 W Ski Boots are the Rx for what ails your feet and your skiing. One of the dominant women's ski boots of the past decade, the RX 90 is a blend of just the right flex and a classic fit for average width feet. Not too stiff on a 2 foot powder day, not too soft to rail some clean carved lines on corduroy, the RX 90 W's add Dual Core technology this year, for an even smoother and more progressive flex that you'll have to feel to believe.