Lighter than the original, the Atom SL Hoody is one of the most useful (and packable) pieces you can own. Wear it as a standalone layer when trail runs take you through cold, wet weather or layer it with a waterproof shell when mountain pursuits demand additional warmth and mobility. Breathable and weather-resistant, it has stretch insulation in the body but not the sleeves or hood — maximizing packability while still delivering focused warmth to your core.

What's been updated: Updated with recycled Fortius™ Air 20 fabric, recycled stretch synthetic insulation, and FC0 DWR finish for improved mobility and a lower footprint. New Octa® Fleece side panels give enhanced breathability and less micro shedding. The StormHood™ is now lined and no longer stowable. The Bird logo is embroidered for long lasting visual.

Features & Specs

Technical features

• Moisture-resistant outer face fabric
• Breathable
• Lightweight
• Compressible and packable
• Durable
• Wind resistant
• Ultralight

Construction

• Fortius™ Air 20 nylon liner is lightweight, breathable, and made with recycled content
• 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 freedom of movement and improve ventilation

Cuff & Sleeves configuration

• Uninsulated, mesh lined sleeves give light protection and regulate temperature

Design & Fit

• Fitted, with articulated patterning for mobility and comfort
• Garment Centre Back Length: Size M is 29"/72cm - Varies by size

Fabric treatment

• FC0 DWR (Durable Water Repellent) finish repels moisture and is PFAS-free

Hem configuration

• Adjustable hem draw cord seals out drafts

Hood configuration

• Adjustable, low profile uninsulated StormHood™

Pocket configuration

• Two hand pockets with hidden zippers

Sustainability

• Contains materials that meet the bluesign® criteria
• Shell - bluesign® approved material
• Contrast - recycled content
• Insulation - recycled content
• Lining - bluesign® approved material
• This article was treated with an anti-odour biocidal product (Polygiene)
• PFAS (Per- and polyfluoroalkyl substances) Compliant

Size XS, S, M, L, XL, XXL

Weight 280g / 9.9 oz

Fit Fitted

Sizing chart

Men's

Jacket/shirt sizing chart - new sizing

Your body measurements in centimetres

Size	Sleeve	Chest	Waist	Hip
XXS	78	84	69	83
XS	81	89	74	88
S	83	94	79	93
M	86	102	86	100
L	89	109	94	108
XL	91	119	104	118
XXL	94	129	114	128
3XL	96	139	124	138

NOTE: Men's fit has been updated with a revised fit. Medium size remains unchanged. Smaller sizes are now tighter and larger sizes are now looser. Arc'teryx sizes are intended to fit the above body measurements. If your measurements are between sizes, select a larger size for a looser fit or a smaller size for a tighter fit.

Activity Alpine/Hike/Everyday

Model X000009560

Manufacturing facility Youngone (CEPZ) LTD, Bangladesh 

Fit & Sizing

Fit: Fitted

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.

 

Materials & Care

Materials

• Contrast: Octa Polyester Fleece, Raschel Anti-shed with 40D Delta Face, Polygiene, 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
• Body: Recycled 20d nylon plain weave weft stretch FC0 DWR, 58gsm - 88% Nylon, 12% Elastane
• Origin of fabric: TAIWAN
• Origin of dying: TAIWAN
• May release plastic microfibres into the environment when washing

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