Men's S/PRO ALPHA C BOA 120 Ski Boots-Salomon-Black-Mountain Sports
Salomon

Men's S/PRO ALPHA C BOA 120 Ski Boots

Stiff 120 flex in a narrow 98 mm last, on GripWalk soles.

$749.95
Color: Black / Samba Met. / Dark Grey Met.
Size:
Size guide
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Top features
ExoDrive construction
Powerlink™ pivot
Custom Shell™ HD
Description

Salomon took the fit skiers already trusted in the original Alpha and built the stiffer version of it. ExoDrive wraps a third cuff overlap around the ankle so the shell, cuff and liner load as one piece instead of fighting each other, and a Powerlink pivot sits lower than usual so what you ask for arrives at the ski sooner.

This is the firm end of the S/Pro Alpha range and Salomon say so themselves. The last is narrow, which is the whole point for a slim foot that wants no slop in it. A BOA dial on the cuff handles the fine tuning, two aluminium buckles do the rest, and every piece that matters unscrews so a bootfitter can get inside and make it yours.

Perfect for
Charging the resort
120 flex, ExoDrive shell.
Narrow feet
98 mm last.
Bootfitting
Custom Shell HD, screwed hardware.
Features
  • ExoDrive construction. A third cuff overlap wraps the ankle so the shell, cuff and liner flex as one piece, which is what holds your heel down when you load the front of the boot.
  • Powerlink™ pivot. A metal component ties the cuff to the shell at a lowered pivot point, shortening the path your input takes to reach the ski.
  • Custom Shell™ HD. A bootfitter can heat and reshape the lower shell, or the shell and cuff together, in about ten minutes.
  • S/Pro CF Expert liner. CF 4D construction with an external Talyn layer, an elastic toe box and an edgeless Custom Tongue 2 that comes out for customizing.
  • BOA® dial and two buckles. One cuff-mounted BOA dial micro-adjusts the wrap while two screwed aluminium buckles and a 45 mm Energyzer strap handle the rest.
Size & Fit
  • Ski boots are sized in Mondopoint, the length of your foot in centimeters, not a shoe size
  • Salomon classify this shell as narrow, 98 mm at the ball of the foot
  • Standing upright your toes should just brush the front; flexing forward should pull them back
  • Liners pack out with use, so a boot that feels roomy new will feel loose by midseason
  • We stock 27.5 and 28.5 in this model
  • If you are between sizes or have a wide forefoot, get measured rather than guessing
Open size guide
Materials
  • Boot shell: polyurethane with Custom Shell HD thin-wall construction.
  • Cuff: polyurethane with a metal Power Spine.
  • Liner: S/Pro CF Expert, cushioned foams with an external Talyn layer.
  • Footbed: Light 2, lightweight foam.
  • Strap: 45 mm screwed Energyzer Velcro.
  • Care: open the buckles and pull the liners out after every day so they dry in shape, away from any direct heat.
About the brand

From trail running to skiing, Salomon has been innovating for mountain life since 1947. Their performance-driven designs deliver precision and confidence wherever the adventure leads. At Mountain Sports, we love Salomon because it’s built for those who play hard in the outdoors — all year long.

Shop all Salomon

SKU L49298500 · Style L49298500
Size guide

Size Charts

The North Face Sizing Chart

Women's Jackets and Tops:

Chest  Waist Hip Sleeve Length
XS 31-32 in 24-25 in 33-35 in 31.5 in
SM 33-35 in 26-28 in 36-37 in 32.0 in
MD 36-38 in 29-31 in 38-40 in 32.5 in
LG 39-41 in 32-34 in 41-43 in 33.3 in
XL 42-44 in 35-38 in 44-47 in 34.0 in
2XL 45-48 in 39-42 in 48-51 in 34.8 in
1X 43-45 in 36-38 in 46-48 in 31.5 in
2X 47-49 in 40-42 in 50-52 in 32.25 in
3X 51-53 in 44-46 in 54-56 in 33 in

 

Women's Bottoms:

Waist  Hips Inseam (Short) Inseam (Reg.) Inseam (Long)

XS (0)

 25-26 in 34-35 in 28.5 in 30.5 in 32.5 in
XS (2) 26-27 in 35-36 in 28.5 in 30.5 in 32.5 in
SM (4) 27-28 in 36-37 in 29.0 in 31.0 in 33.0 in
SM (6) 28-29 in 37-38 in 29.0 in 31.0 in 33.0 in
MD (8) 29-30 in 38-39 in 29.0 in 31.0 in 33.0 in
MD (10) 30-31 in 39-40 in 29.0 in 31.0 in 33.0 in
LG (12) 31-33 in 40-42 in 29.0 in 31.0 in 33.0 in
LG (14) 33-35 in 42-44 in 29.5 in 31.5 in 33.5 in
XL (16) 35-37 in 44-46 in 29.5 in 31.5 in 33.5 in
XL (18) 37-39 in 46-48 in 29.5 in 31.5 in 33.5 in
1X (14) 36-37 in 46-47 in 28 in 30 in 32 in
1X (16) 37-38 in 47-48 in 28 in 30 in 32 in
2X (18) 40-41 in 50-51 in 28 in 30 in 32 in
2X (20) 41-42 in 51-52 in 28 in 30 in 32 in
3X (22) 44-45 in 54-55 in 28 in 30 in 32 in
3X (24) 45-46 in 55-56 in 28 in 30 in 32 in


Women's Footwear

USA UK EU CM
5 3 36 22
5.5 3.5 36.5 22.5
6 4 37 23
6.5 4.5  37.5 23.5
7 5 38 24
7.5 5.5 38.5 24.5
8 6 39 25
8.5 6.5 39.5 25.5
9 7 40 26
9.5 7.5 40.5 26.5
10 8 41 27
10.5 8.5 41.5 28
11 9 42 28.8

 

Men's Jackets and Tops:

Chest  Hips Sleeve Length
SM 36-38 in 35-37 in 33.5 in
MD 39-41 in 38-40 in 34.0 in
LG 42-44 in 41-43 in 34.8 in
XL 45-48 in 44-46 in 35.5 in
2XL 49-52 in 47-49 in 36.3 in
3XL 53-56 in 50-52 in 37.0 in

 

Men's Bottoms:

Waist  Hip  Inseam (Short) Inseam (Reg.) Inseam (Long)
30(SM) 29-30 in 35-36 in 29.5 in 31.5 in 33.5 in
32(MD) 31-32 in 37-38 in 30.0 in 32.0 in 34.0 in
34(MD) 33-34 in 39-40 in 30.0 in 32.0 in 34.0 in
36(LG) 35-36 in 41-42 in 30.0 in 32.0 in 34.0 in
38(LG) 37-38 in 43-44 in 30.5 in 32.5 in 34.5 in
40(XL) 39-40 in 44-45 in 30.5 in 32.5 in 34.5 in
42(XL) 41-42 in 46-47 in 30.5 in 32.5 in 34.5 in
44(2X) 43-44 in 47-48 in 30.5 in 32.5 in 34.5 in

 

Men's Shoes:

USA UK EU CM
7 6 39 25
7.5 6.5 40 25.5
8 7 40.5 26
8.5 7.5  41 26.5
9 8 42 27
9.5 8.5 42.5 27.5
10 9 43 28
10.5 9.5 44 28.5
11 10 44.5 29
11.5 10.5 45 29.5
12 11 45.5 30
12.5 11.5 46 30.5
13 12 47 31
13.5 12.5 47.5 31.5
14 13 48 32
14.5 13.5 49 32.5

 

Boys:

Height Weight Chest Waist
XXS (5) 42-44 in 40-43 lbs 23-24 in 22-23 in
XS (6) 45-47 in 44-50 lbs 24-25 in 22-23 in
SM (7-9) 48-53 in 51-65 lbs 25-27 in 23-24 in
MD (10-12) 54-59 in 66-87 lbs 27-29 in 24-26 in
LG (14-16) 60-64 in 88-115 lbs 30-32 in 27-29 in
XL (18-20) 65-69 in 116-140 lbs 33-35 in 29-31 in

 

Girls:

Height Weight Chest Waist
XXS (5) 42-44 in 40-43 lbs 23-24 in 22-23 in
XS (6) 45-47 in 44-50 lbs 24-25 in 22-23 in
SM (7-9) 48-53 in 51-65 lbs 25-27 in 23-24 in
MD (10-12) 54-59 in 66-87 lbs 27-29 in 24-26 in
LG (14-16) 60-63 in 86-105 lbs 30-32 in 27-29 in
XL (18-20) 64-65 in 106-115 lbs 33-35 in 30-32 in


Patagonia Sizing Chart

Women's Tops:

Measurements are in inches, unless otherwise noted.

  Numeric Chest Waist Hip Inseam
XX-Small 00 31 24½ 33½ 30
X-Small 0-2 32-33 25½-26½ 34½-35½ 31
Small 4-6 34-35 27½-28½ 36½-37½ 32
Medium 8-10 36-37 29½-30½ 38½-39½ 32
Large 12-14 38½-40 32½-33½ 41-42½ 32
X-Large 16-18 42-44 35½-37½ 45½-46½ 32
XX-Large 20-22 46-48 40½-41½ 48½-50½ 32

 

Women's Bottoms:

Measurements refer to body size, not garment dimensions, and are in inches, unless otherwise noted.
* Inseam will vary depending on style; when lengths are offered, "short" is 30, "regular" is 32 and "long" is 34, unless otherwise noted.

  Size Jeans & Cords Natural Waist Inseam
XX-Small 00 24 24.5 30
X-Small 0 25 25.5 31
X-Small 2 26 26.5 31
Small 4 27 27.5 32
Small 6 28 28.5 32
Medium 8 29 29.5 32
Medium 10 30 30.5 32
Large 12 31 32 32
Large 14 32 33.5 32
X-Large 16 33 35.5 32
X-Large 18 34 37.5 32
XX-Large 20 — 39.5 32
XX-Large 22 — 41.5 32

 

Men's Tops:

  Chest Sleeves Waist Neck Inseam
XX-Small 31-33 31 26 13½-14 30
X-Small 34-35 32 28 14-14½ 31
Small 35-37 33 29-30 15-15½ 31
Medium 38-40 34 31-33 15½-16 32
Large 42-44 35 34-36 16½-17 33
X-Large 46-48 36 38-40 17-17½ 33
XX-Large 50-52 37 42-44 17½-18 33
XXX-Large 54-56 38 46-48 18½ 33

 

Kids:


Boys' Sizes Chest Waist Height Weight (lbs.)
X-Small 5-6 23-24 22½-23 44-46½ 42-49
Small 7-8 25½-26½ 23½-24½ 49½-52 52-68
Medium 10 27½ 25½ 55½ 71-85
Large 12 28½ 26½ 58½ 87-100
X-Large 14 30½ 28 61½ 102-112
XX-Large 16-18 32-33½ 29½-31 64-66½ 114-135

Girls' Sizes Chest Waist Height Weight (lbs.)
X-Small 5-6 23-24 22½-23 44-46½ 42-49
Small 7-8 26-27 23½-24½ 50½-52½ 52-68
Medium 10 28½ 25 55 71-87
Large 12 30 26 58 87-100
X-Large 14 31½ 28 61 102-112
XX-Large 16-18 33½-35½ 30-32 62½ 114-135

 

Socks

Socks SM MD LG XL
US Mens 3-5.5 6–8.5 9–11.5 12–14.5
US Womens 4-6.5 7–9.5 10–12.5 ----
Euro 34-37 38–41 42–45 46–49
UK 2-4.5 5–7.5 8–10.5 11–13.5
Performance

How it ranks across conditions.

Calibrated against comparable products we stock, so you can compare like for like.

Flex

Soft
Medium
Stiff
Race

Flex index 120. Salomon call the stiffness Hard on their own scale, a step up from the 110 in the same shell.

Fit width

Narrow (98mm)
Medium (100mm)
Wide (102mm+)

Salomon classify this shell as narrow at 98 mm. If your forefoot is wide, this is the wrong boot before anything else about it matters.

Warmth

Light
Moderate
Warm

Salomon publish no warmth rating. A thin performance liner like the S/Pro CF Expert is warm enough for resort days and is not an insulated touring liner.

Walkability

Ski only
Some walking
GripWalk sole

No walk mode, but Salomon do publish the sole standard here: GripWalk, Adult, ISO 23223. Rockered rubber walks better than a flat alpine block.

Best for

Is this right for you?

All-mountain resort skiing

Steeps, chopped-up groomers and long fast runs, where a boot that flexes as one piece is what keeps the ski on edge.

Not for: Not a touring boot. There is no walk mode and no tech fitting, so uphill days are out. Need the skis too? Browse our skis

Narrow, low-volume feet

A slim foot with a low instep gets a boot that holds it without a fitter having to punch volume out of the shell.

Not for: A wide forefoot or a high instep will hurt in this boot and no amount of molding fixes a last that is the wrong shape. Wider foot? Browse all ski boots

Skiers who get boots fitted

Custom Shell HD, a moldable liner and screwed rather than riveted hardware make this an easy boot for a fitter to work on.

Not for: Not the cheapest way into skiing if you plan to buy off the shelf and never touch it again. Everything else for the hill

Full spec sheet

Technical Specs

Flex index120 — Salomon rate the stiffness Hard on their own scale
Last widthNarrow, 98 mm at the ball
ClosureOne screwed BOA Fit System dial, two screwed aluminium buckles, 45 mm screwed Energyzer Velcro power strap
LinerS/Pro CF Expert — CF 4D construction, external Talyn, elastic toe box, edgeless Custom Tongue 2, heat moldable
SoleGripWalk, Adult (ISO 23223). Needs a GripWalk-compatible binding — most modern alpine bindings take both.
Walk modeNone
Weight1870 g per boot, about 4 lb 2 oz. Salomon do not publish the reference size.
Best forAll-mountain resort skiing — Salomon rate the level of practice advanced
Shell sizesSalomon make 24/24.5 to 30/30.5 Mondopoint. We stock 27.5 and 28.5 in this model.
Questions, answered

Before you buy.

Pulled from chats, emails and store visits. The things people actually ask us before they buy. Don't see yours?

Ask a question
What does the flex number actually mean?

It is how hard the boot resists your shin pushing forward. Higher numbers resist more. The scale is not standardized between brands, so a 120 from one maker is not exactly a 120 from another. As a rough guide, 90 to 100 suits most intermediates, 110 to 120 suits strong skiers, and 130 and up is race territory.

How is this different from the 110?

Same shell, same 98 mm narrow last, same closure. The 120 is stiffer, which Salomon rate Hard against the 110's Medium, it runs a little lighter at 1870 g, and it steps up to the S/Pro CF Expert liner. The 120 also publishes a GripWalk sole standard where the 110 does not.

Do these need heat molding, and do you do it?

They do not need it to be skiable, but this boot is built for it: the shell takes Custom Shell HD and the liner is moldable. Ask our shop about bootfitting before you buy, since a fitted boot in the right size beats a more expensive boot in the wrong one.

Will these work with my bindings?

Salomon publish a GripWalk Adult sole on this boot, ISO 23223. That means it needs a GripWalk-compatible binding, and most modern alpine bindings take both GripWalk and ISO 5355. If yours is older or you are not sure what it accepts, ask us and we will check it against the boot.

How should a ski boot fit compared with a shoe?

Much tighter. Standing upright, your toes should just brush the front of the liner; flexing forward should pull them back off it. Ski boots are sized in Mondopoint, the length of your foot in centimeters, so your shoe size is only a starting point. Liners also pack out, so a boot that feels roomy new will feel loose by midseason.

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