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

A precise, powerful 120 flex boot with a cuff BOA dial.

$749.95
Color: Black / Samba Met. / Dark Grey Met.
Size:
Size guide
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Top features
ExoDrive construction
Powerlink pivot
Cuff-mounted BOA Fit System
Description

Built on the trusted fit of the original Alpha, the Salomon S/Pro Alpha C BOA 120 delivers smooth, responsive energy transfer. ExoDrive construction and a Powerlink lower pivot drive power to the ski, and a cuff-mounted BOA Fit System adds micro-level precision. The 98 mm last gives a performance fit, and the S/Pro CF Expert liner with an edgeless Custom Tongue 2 can be tailored to your foot. It's an advanced, 120 flex all-mountain boot with GripWalk soles.

Perfect for
Precise
98 mm last.
Locked in
Cuff BOA dial.
Powerful
ExoDrive + Powerlink.
Features
  • ExoDrive construction. A third cuff overlap improves heel hold and lets the boot flex as one unit.
  • Powerlink pivot. A lowered metal pivot links cuff and shell for direct energy transfer.
  • Cuff-mounted BOA Fit System. Micro-adjustable fit with superior heel hold.
  • Power spine. A metal plate for strong back support and progressive rebound.
  • Custom Shell HD. A bootfitter can personalize the lower shell, or shell and cuff, in 10 minutes.
Size & Fit
  • 98 mm last, narrow width, per Salomon.
  • Boot fitting at The Snow Shop.
Open size guide
Materials
  • Polyurethane shell and cuff, per Salomon.
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

Flex index 120, per Salomon.

Ability level

Beginner
Intermediate
Advanced
Expert

Advanced, per Salomon.

Best for

Is this right for you?

Advanced

A stiff, precise boot for strong skiers who drive their skis.

Not for: For relaxed cruising, a softer, roomier boot is more comfortable. Shop ski boots

Full spec sheet

Technical Specs

Weight4 lb 2 oz per boot
Flex120 (Salomon: Hard)
Last width98 mm, narrow
Sole normGripWalk, ISO 23223
LinerS/Pro CF Expert, Custom Tongue 2
ClosureCuff BOA Fit System, 2 aluminum buckles, 45 mm Energyzer strap
ShellPolyurethane, Custom Shell HD, ExoDrive cuff
FootbedLight 2
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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