LAST 98,VOLUME LV,FLEX115 W. The Mach1 LV 115 W is the benchmark for performance, fit and customization in women’s high-performance ski boots. Fit is priority number one and an anatomically shaped 98mm low volume shell and a women's specific liner with Custom Adaptive Shape - C.A.S. - technology, provides a great fit right out of the box but allows the boots to be fully customized if need be.