How do I know if I need HV (103mm) or MV (100mm)?

Have your foot measured at a ski shop. If your forefoot is 103mm or wider at the widest point, or if medium-volume boots feel tight across the ball of the foot, the HV is the right choice. If your foot measures around 100mm, the MV will fit better.

Can the C.A.S. shell be narrowed if the boot feels too wide?

C.A.S. is designed to expand, not contract. If the boot feels too loose, you likely need the MV (100mm) version instead. A bootfitter can add padding or thicker insoles, but a properly fitting shell is always better.

Tecnica Mach Sport HV 75 W

PTO ReviewSki Boots

Tecnica Mach Sport HV 75 W

Mach Sport family · 25/26

Flex 75

Medium

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SofterStiffer

Last Width

103mm— Wide (102mm+)

The Mach Sport HV 75 W is the wide-foot version of Tecnica's entry-to-intermediate women's boot. Same shell tech, same C.A.S. customization, same Celliant liner, same Double Quick Instep entry — but with a 103mm high-volume last instead of 100mm. For women with wider feet who've been sizing up to get comfort, this boot fits properly from the start without sacrificing the C.A.S. heat-moldable customization that makes Tecnica boots bootfitter-friendly.

At $344 — the same price as the MV version — there's no penalty for choosing the wider fit. If your foot measures 103mm or wider at the forefoot, or you've always felt squeezed in medium-volume boots, this is the right choice. Flex 75 is forgiving for developing skiers, and the GripWalk sole helps with traction in the lodge.

Strengths

+103mm wide last with C.A.S. customization — wide-footed women get proper fit and moldability
+Same price as the MV version — no premium for wider fit
+Double Quick Instep for easy entry on both sides of the boot

Best For

Beginner-to-intermediate women with wide feet who want a comfortable, customizable boot with GripWalk at an accessible price.

Limitations

−No walk mode — lodge and parking lot walking only
−Flex 75 provides limited support for strong skiers
−Wide last may feel too roomy for medium-width feet — try the MV 75 W instead

Not For

Medium or narrow feet (boot will be too loose), strong intermediate skiers who need 90+ flex, or anyone needing walk mode.

Common Questions

How do I know if I need HV (103mm) or MV (100mm)?: Have your foot measured at a ski shop. If your forefoot is 103mm or wider at the widest point, or if medium-volume boots feel tight across the ball of the foot, the HV is the right choice. If your foot measures around 100mm, the MV will fit better.
Can the C.A.S. shell be narrowed if the boot feels too wide?: C.A.S. is designed to expand, not contract. If the boot feels too loose, you likely need the MV (100mm) version instead. A bootfitter can add padding or thicker insoles, but a properly fitting shell is always better.