The Mach1 Women’s collection features our most anatomically shaped shells and liners based on the female anatomy to ensure fit and performance. Available in two distinct shell lasts, Low (LV) and Mid (MV) Volume, Mach1 W offers a great fit right out-of-the box for a variety of foot shapes. Coupled with the Custom Adapative Shape (C.A.S.) Liner, Shell, Boot Board and the new C.A.S. Cuff Adapt system, Mach1 W’s boots can be easily and quickly customized to your foot and lower leg shape.