Alien 4.0 (Spring 2026)

$2,699.00

$809.70

70% OFF

Color: Black

Size: 39

Footwear & Apparel Size Charts

For the most accurate fit, measure your foot in centimeters and cross-reference it with the chart before ordering. Shoes ship in US sizes.

Men's Shoe Size Chart

US	UK	EU	CM
4	3	37	22
4.5	3.5	37.5	22.5
5	4	38	23
5.5	4.5	38.5	23.5
6	5	39	24
6.5	5.5	39.5	24.5
7	6	40	25
7.5	6.5	40.5	25.5
8	7	41	26
8.5	7.5	42	26.5
9	8	42.5	27
9.5	8.5	43	27.5
10	9	44	28
10.5	9.5	44.5	28.5
11	10	45	29
11.5	10.5	46	29.5
12	11	46.5	30
12.5	11.5	47	30.5
13	12	48	31
14	13	49	32
15	14	50	33
16	15	51.5	34

Use the CM column as your most reliable guide. Add about 1 cm of room at the front for natural foot expansion while running.

Women's Shoe Size Chart

US	UK	EU	CM
4	2	34.5	20.5
4.5	2.5	35	21
5	3	35.5	21.5
5.5	3.5	36	22
6	4	37	22.5
6.5	4.5	37.5	23
7	5	38	23.5
7.5	5.5	38.5	24
8	6	39	24.5
8.5	6.5	40	25
9	7	40.5	25.5
9.5	7.5	41	26
10	8	42	26.5
10.5	8.5	42.5	27
11	9	43	27.5
11.5	9.5	44	28
12	10	44.5	28.5
13	11	46	29.5

Use the CM column as your most reliable guide. Add about 1 cm of room at the front for natural foot expansion while running.

Men's Tops & Outerwear

Size	Chest	Hips	Long Sleeve Length
Small	36–38 in	35–37 in	33.5 in
Medium	39–41 in	38–40 in	34.0 in
Large	42–44 in	41–43 in	34.8 in
X-Large	45–48 in	44–46 in	35.5 in
2X-Large	49–52 in	47–49 in	36.3 in

Men's Bottoms

Size	Waist	Hip	Inseam
Small	29–30 in	35–36 in	31.5 in
Medium	31–34 in	37–40 in	32.0 in
Large	35–38 in	41–44 in	32.5 in
X-Large	39–42 in	44–47 in	32.5 in
2X-Large	43–44 in	47–48 in	32.5 in

Women's Tops & Outerwear

Size	Chest	Waist	Hip	Sleeve Length
X-Small	31–32 in	24–25 in	33–35 in	31.5 in
Small	33–35 in	26–28 in	36–37 in	32.0 in
Medium	36–38 in	29–31 in	38–40 in	32.5 in
Large	39–41 in	32–34 in	41–43 in	33.3 in
X-Large	42–44 in	35–38 in	44–47 in	34.0 in
2X-Large	45–48 in	39–42 in	48–51 in	34.8 in

Women's Bottoms

Size	Waist	Hips	Inseam
X-Small (0)	25–26 in	34–35 in	30.5 in
X-Small (2)	26–27 in	35–36 in	30.5 in
Small (4)	27–28 in	36–37 in	31.0 in
Small (6)	28–29 in	37–38 in	31.0 in
Medium (8)	29–30 in	38–39 in	31.0 in
Medium (10)	30–31 in	39–40 in	31.0 in
Large (12)	31–33 in	40–42 in	31.0 in
Large (14)	33–35 in	42–44 in	31.5 in
X-Large (16)	35–37 in	44–46 in	31.5 in
X-Large (18)	37–39 in	46–48 in	31.5 in

How to Measure Your Foot

Step 1Place a sheet of paper on a hard floor against a wall. Stand on it with your heel lightly touching the wall.

Step 2Mark the tip of your longest toe and the outermost point of your heel. Repeat with the other foot.

Step 3Measure the distance between the marks for both feet, add 0.5 cm for room, then match it to the chart.

For the most accurate result, measure your feet at the end of the day when they are naturally slightly swollen. If your two feet differ, use the longer foot when reading the chart.

Quantity

Estimate delivery times: 12-26 days (International), 3-6 days (United States).

Return within 60 days of purchase. Duties & taxes are non-refundable.

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Alien 4.0 (Spring 2026)

Pure speed, maximum precision, the Alien 4.0 is SCARPA's lightest, most advanced ski mountaineering boot ever. Built for elite racers and high-efficiency tourers, it delivers race-grade performance with technical refinement inspired by SCARPA's World Cup heritage. The carbon-fiber shell and cuff provide unmatched stiffness and ultralight weight, giving athletes direct energy transfer and instant response. The Speed Lock Lite mechanism offers a 76-degree range of motion for a fluid, natural stride on steep climbs. The BOA® Fit System ensures quick, micro-adjustable closure, while the Intuition® Race 4.0 SL liner delivers warmth, comfort, and precision fit in a feather-light package. A Vibram® UFO 4.0 sole gives dependable traction on rock, ice, and refrozen snow.

Every detail is engineered for one goal: maximum speed with total control.

Full carbon-fiber shell and cuff deliver ultimate torsional rigidity and strength at the lightest possible weight.
Speed Lock Lite walk mode provides a 76-degree range of motion for efficient uphill movement and secure downhill control.
BOA® Fit System enables quick, precise, glove-friendly adjustments for a locked-in feel.
Intuition® Race 4.0 SL liner offers heat-moldable fit, warmth, and low-profile comfort for long, cold alpine pushes.
Vibram® UFO 4.0 sole ensures reliable traction and grip on icy approaches and technical transitions.

The Alien 4.0 is pure carbon speed built for racers who turn every climb and descent into performance perfected.

Alien 4.0 (Spring 2026)

Alien 4.0 (Spring 2026)

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Alien 4.0 (Spring 2026)

Alien 4.0 (Spring 2026)

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