FISCHER RC4 120 MV VAC BOA Men's Ski Boots (U06425)

The Fischer RC4 120 MV VAC BOA represents the perfect balance of World Cup racing engineering and the most cutting-edge customization technologies on the market. Developed for advanced and expert skiers who require unrelenting edge response on-piste but refuse to suffer the painful pinching of narrow race boots, this model incorporates a 100 mm MV (Medium Volume) last to provide the ideal space for standard-width feet or slightly higher insteps.

The most revolutionary element is the integration of the BOA® Fit System (H+i1) into the lower part of the shell. Instead of traditional buckles that can crush the instep from the top down, the BOA system distributes tension circularly and evenly around the entire forefoot. This wraps the foot with micro-precise accuracy, entirely eliminates dead zones, locks the heel immovably in place, and immediately optimizes lateral response and edge control on hardpack or icy snow.

The outer shell is manufactured from Vacu-Plast, Fischer's exclusive polymer that stands out for maintaining its stable elastic properties in extreme cold, preventing the boot from becoming excessively rigid and uncomfortable during harsh winter days. Thanks to VACUUM technology, the outer shell can be fully heat-molded at 80 °C by specialized bootfitters, allowing the boot to be custom-shaped around the unique morphology of the skier. Technical efficiency is further boosted by the Soma Tec architecture, which respects the natural "V-position" of the feet, enabling you to steer your skis with surgical precision with significantly less strain on your knees. Rounded out with a 3D pre-shaped liner, a 45 mm upper power strap for a solid lock, and revolutionary GripWalk® soles, the RC4 120 MV BOA is the ultimate premium tool to dominate the slopes with absolute authority and comfort.

Technical Parameters

• Flex Index: 120 (High stiffness tailored for athletic performance, instant power transfer, and elastic responsiveness).

• Last Width: 100 mm (MV - Medium Volume, the perfect balance between precise foothold and comfort for average-width feet).

• Shell Closure System: Integrated BOA® Fit System (H+i1) on the instep and forefoot area for millimeter wrapping, uniform pressure distribution, and maximum edge control.

• Shell Technology: VACUUM fully heat-moldable shell at 80 °C allowing a perfect anatomical fit to the skier's foot contours.

• Shell Material: Vacu-Plast (Fischer's exclusive polymer that guarantees a consistent and predictable flex regardless of outdoor temperature changes).

• Soma Tec: Factory-integrated natural "V-position" of the feet, which optimizes ski control and protects knee and ankle joints.

• Liner: RC4 Performance MV (3D pre-shaped, optimized for medium volume, with high-density foam for immediate heel retention).

• Adjustable Tongue: Grindable Tongue (Modifiable tongue that allows thickness reduction by a specialist to relieve pressure on high insteps).

• Soles: Pre-mounted GripWalk® (GW) (Offer maximum safety, grip, and traction across slippery or icy terrain and a natural foot roll while walking).

• Upper Buckles: 2 micro-adjustable high-resistance aluminum buckles on the cuff.

• Power Strap: 45 mm heavy-duty velcro strap for a solid, highly responsive upper cuff closure.

• Recommended Level: Advanced - Expert.