Arc'teryx's lightest insulated layer brings warmth exactly where you need it. The Atom SL features recycled stretch insulation concentrated on your core, while uninsulated sleeves and breathable side panels keep you mobile during intense activity. Whether you're tackling shoulder-season summits or winter trail runs, this jacket adapts to your pace without weighing you down. Trusted by mountaineers, runners, and outdoor professionals who demand performance without compromise.

Technical features

• Moisture-resistant outer face fabric
• Breathable
• Lightweight
• Abrasion resistant

Construction

• Lightweight stretch Octa® Fleece side panels provide freedom of movement and improve ventilation
• Durable, lightweight Fortius™ Air 20 stretch nylon plain-weave face fabric for maximum airflow
• Ultra-breathable, 100% recycled stretch Coreloft™ synthetic insulation keeps your torso warm
• Uninsulated sleeves for reduced weight, extra arm mobility, and easy packability

Design & Fit

• Garment Centre Back Length: Size M is 27.5"/70cm - Varies by size

Fabric treatment

• FC0 DWR (Durable Water Repellent) finish repels moisture and is free from intentionally added PFAS

Hem configuration

• Dual hem cinches seal out drafts and adjust length

Patterning

• Articulated patterning for unrestricted mobility

Pocket configuration

• Chest pocket with zip
• Two hand pockets with zippers

Sustainability

• Contains materials that meet the bluesign® criteria
• Shell - bluesign® approved material
• Contrast - recycled content
• Insulation - recycled content
• Lining - bluesign® approved material
• PFAS (Per- and polyfluoroalkyl substances) Compliant

Materials

• 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
• Body: Fortius™ Air 20 - Plain Weave, FC0 DWR, 58gsm - 88% Nylon, 12% Elastane
• Origin of fabric: TAIWAN, CHINA
• Origin of dyeing: TAIWAN, CHINA
• Origin of Manufacture: BANGLADESH
• May release plastic microfibres into the environment when washing
• Origin of fabric: VIETNAM
• Origin of dyeing: VIETNAM