Mens Atom Vest-Vests-Arc'teryx-Mongoose-Mountain Sports
Arc'teryx

Men's Atom Vest

Performs-even-when-wet core warmth for hiking, climbing, touring, and living in.

$200
Color: Mongoose
Size:
Size guide
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Top features
Moisture-resistant outer face fabric
Fortius™ Air 20 nylon liner
Stretch synthetic insulation
Description

If you want the warmth of an Atom Hoody with a wider range of motion and smaller footprint, you’re in the right place. Pull on the Atom Vest when you feel the temperature dropping on longer hikes and climbs or wear it as a midlayer under a shell for touring and wet winter objectives. The Coreloft synthetic insulation stays warm even if you run into light weather, making it a better alternative to down for high-output days year round.

Perfect for
Trail
Hiking and mountain days.
Cold weather
Warm even when damp.
Built to last
Covered by the Arc'teryx warranty.
Features
  • Moisture-resistant outer face fabric.
  • Fortius™ Air 20 nylon liner. Fortius™ Air 20 nylon liner is lightweight, breathable, and made with recycled content
  • Stretch synthetic insulation. Stretch synthetic insulation is breathable, warm, and light, adds freedom of movement, and is made with recycled content
  • Lightweight stretch Octa® Fleece side panels provide…. Lightweight stretch Octa® Fleece side panels provide freedom of movement and improve ventilation
  • FC0 DWR (Durable Water Repellent) finish repels moisture…. FC0 DWR (Durable Water Repellent) finish repels moisture and is free from intentionally added PFAS
  • Adjustable hem draw cord seals out drafts.
Size & Fit
Slim
Regular
Relaxed

Close to the body. Size up if you're between sizes or want room to layer underneath.

  • Our trimmer fit is patterned to stay close to the body through the chest, waist, hip, and thigh. Its low profile eliminates bulk, moves with the body, and fits comfortably over first layers or under outer layers.
  • Garment Centre Back Length: Size M is 28"/71cm - Varies by size
Open size guide
Materials
  • Body: Fortius™ Air 20 - Plain Weave, FC0 DWR, 58gsm - 88% Nylon, 12% Elastane.
  • Contrast: Octa® Polyester Fleece, 40D Delta Face, 122gsm - 100% Polyester.
  • Synthetic Insulation: Coreloft™ Stretch, 40gsm - 100% Polyester.
  • Lining: Recycled 20d nylon plain weave weft stretch FC0 DWR, 58gsm - 88% Nylon, 12% Elastane.
  • Care: Machine wash gentle low; Tumble dry gentle low; Do not bleach; Wash dark colours separately; Do not dry clean; Do not iron; Do not use fabric softener; Double rinse; Do not wring.
About the brand

Born in the Coast Mountains of British Columbia, Arc’teryx designs gear built for the wildest weather and the steepest lines. Every jacket, pack, and layer is engineered for precision and performance — because when conditions get real, your gear should too. At Mountain Sports, we love Arc’teryx for its unmatched craftsmanship and commitment to doing more with less, in nature’s harshest playgrounds.

Shop all Arc'teryx

SKU X000009559 · Style X000009559
Size guide

Arc'teryx Size Chart - Men's Apparel

Arc'teryx Sizing Chart

Measurements are in inches, unless otherwise noted. Charts reflect body measurements, not garment measurements.

Men's Jackets & Shirts:

Size Sleeve Chest Waist Hip
XXS 30 33 27 32.5
XS 31.5 35 29 34.5
S 32.5 37 31 36.5
M 34 40 34 39.5
L 35 43 37 42.5
XL 36 47 40.5 46.5
XXL 37 51 44.5 50
3XL 38 54.5 48.5 54

Arc'teryx sizes are intended to fit the body measurements above. If your measurements are between sizes, select a larger size for a looser fit or a smaller size for a tighter fit. Arc'teryx has recently updated the men's fit: medium remains unchanged, smaller sizes now fit tighter and larger sizes now fit looser.

Men's Pants & Shorts (Alpha Sizes):

Size Waist Hip Regular Inseam Short Inseam Tall Inseam
XXS 27 32.5 31 29 34
XS 29 34.5 31 29 34
S 31 36.5 31.5 29.5 34.5
M 34 39.5 32 30 35
L 37 42.5 32.5 30.5 35.5
XL 40.5 46.5 33 31 36
XXL 44.5 50 33 31 36
XXXL 48.5 54 - - -

Men's Pants (Numeric Waist Sizes):

Size Waist Hip Regular Inseam Short Inseam Tall Inseam
28 30 35.5 31 29 34
29 31 36.5 31.5 29.5 34.5
30 32 37.5 31.5 29.5 34.5
31 33 38.5 32 30 35
32 34 39.5 32 30 35
33 35 40.5 32 30 35
34 36 41.5 32.5 30.5 35.5
36 38 43.5 33 31 36
38 40 45.5 33 31 36

Numeric pant sizes correspond to the body measurements shown above. Several Arc'teryx pant models are sized numerically and may be offered in Short, Regular, and Tall inseam lengths - see each product page for the options available.

How to measure: Sleeve - with your arm relaxed at your side and slightly bent, measure from the center back of your neck, across the shoulder, over the elbow and down to the wrist. Chest - with arms relaxed at your sides, measure under your arms around the fullest part of your chest. Waist - measure around your waist at the narrowest part. Hip - standing with feet hip width apart, measure around your hips at the widest part. Inseam - from a standing position, measure from your crotch down the inside of your leg to the floor.
Performance

How it ranks across conditions.

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

Warmth

Light
Moderate
Warm
Warmest

Synthetic insulation.

Weather protection

Water resistant
Water repellent
Highly weatherproof
Waterproof

PFAS-free FC0 DWR finish sheds light rain.

Breathability

Low
Moderate
High
Very high

Air-permeable construction.

Packability

Bulky
Moderate
Packable
Ultralight

Brand-stated weight 195g.

Best for

Is this right for you?

Hiking and trail days

Moves well on the up, layers under a shell when the weather turns.

Not for: High-output efforts in mild weather; you will overheat.

As a midlayer

Slim enough to wear under a hardshell without binding at the shoulders.

Not for: Wearing over a bulky jacket — layer it under, not on top.

Everyday wear

Clean enough for town; the fabric stands up to a pack and a car seat.

Not for: Formal occasions.

Full spec sheet

Technical Specs

Style numberX000009559
Weight195g / 6.9 oz
FitFitted
Centre Back LengthSize M is 28"/71cm - Varies by size
ContrastOcta® Polyester Fleece, 40D Delta Face, 122gsm - 100% Polyester
Synthetic InsulationCoreloft™ Stretch, 40gsm - 100% Polyester
LiningRecycled 20d nylon plain weave weft stretch FC0 DWR, 58gsm - 88% Nylon, 12% Elastane
BodyFortius™ Air 20 - Plain Weave, FC0 DWR, 58gsm - 88% Nylon, 12% Elastane
Country of manufactureBangladesh
VendorArc'teryx
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
How do I wash it?

Arc'teryx specify: Machine wash gentle low; Tumble dry gentle low; Do not bleach; Wash dark colours separately; Do not dry clean; Do not iron.

Where is it made?

This style is manufactured in Bangladesh. Arc'teryx publish the facility as YOUNGONE (CEPZ) LTD, Bangladesh.

How does it fit?

Arc'teryx call this a fitted fit. Our trimmer fit is patterned to stay close to the body through the chest, waist, hip, and thigh. Its low profile eliminates bulk, moves with the body, and fits comfortably over first layers or under outer layers.

Does the insulation still work if it gets wet?

Largely, yes — that is the point of synthetic fill. Unlike down, Coreloft keeps most of its loft when damp, so it stays warm in wet cold where down would collapse. It is not waterproof; in sustained rain wear a shell over it.

What does the Arc'teryx warranty cover?

Arc'teryx warrant their garments against defects in materials and workmanship for the practical lifetime of the product. That covers manufacturing faults, not wear and tear or accidental damage. Bring it to us and we will help you start the claim.

Real people, always

Our story

Someone who's been there

Ask about a trail, a tent or a fit, and a person who uses the gear writes back.

Picked, not just stocked

We carry the brands we trust on our own weekends outside.

Easy if it's not right

Free 30-day returns, and help finding the one that is.

Free shipping over $150

Shipped nationwide since '96. Some exclusions apply.