Performance fit gets more accessible in the Salomon S/Pro Alpha BOA 100, a 98mm all-mountain boot that brings the same ExoDrive construction and cuff-mounted BOA system as its stiffer siblings to a friendlier 100 flex. A snug last and a heat-moldable shell mean this boot still skis like a performance product, but the softer flex opens it up to a wider range of skier strength and ability levels.

Why we like it:

The ExoDrive third-cuff overlap is the real differentiator here; even at a 100 flex, this boot wraps the ankle and heel more securely than traditional two-overlap shells, and that translates to noticeably better edge control on firm snow.

Who it's for:

Advancing intermediates and advanced skiers with narrower feet who want a true performance fit without committing to a 120-plus flex. The 98mm last is firmly low-volume, so this is built for skiers with skinny to medium-narrow feet. The 100 flex makes it accessible for skiers building strength and refining technique while keeping the door open for harder skiing as ability grows.

Highlights:

The shell and cuff are both polyurethane, and ExoDrive adds a third overlap that improves heel hold and lets the boot flex as a more unified system. Closure runs through a BOA Fit System dial mounted at the cuff replacing the upper buckle, paired with two screwed aluminum buckles down low. Tucked inside is the heat-moldable S/Pro CF Expert liner with Light² Footbed, with 4D Talyn construction and the new edgeless Custom Tongue 2.0 for serious customization options. A 45mm screwed Energyzer Velcro power strap finishes the top. GripWalk soles are factory-mounted to ISO 5355. For finer tuning, the cuff alignment is screwed and a 6mm back spoiler comes premounted, giving a fitter plenty of room to work.

Things to consider:

The 98mm last is performance-oriented and won't suit wider feet; skiers with medium- or high-volume feet are better served by the S/Pro Supra series at 100mm. The 100 flex is appropriate for a wide range of skiers but advanced and expert skiers who want maximum response should size up to the 110 or 120.

Fit & sizing considerations:

Most skiers won't need to deviate from their normal mondopoint, but at the 100-flex level a fitting appointment is worth booking to dial in fit and alignment.