Light, packable and proven, the Atom LT – an Arc’teryx icon – is a performance warming layer for backcountry adventures, alpine ascents and downtown commutes. Refined for its next generation, we elevated its performance and extended its versatility. The Coreloft™ Compact 60 insulation retains heat when wet and withstands repeated packing and unpacking. The soft, durable Tyono™ 20 face fabric resists wind and weather, and stretch fleece side panels improve ventilation and freedom of movement.
Redesign includes an update to the cuff construction for easier on/off and layering, an updated material package for enhanced durability, updated fit, and a dope dyed liner.
[tabtitlestart]Details[tabtitleend]Features
- Technical Features
- Moisture-resistant outer face fabric
- Breathable
- Insulated
- Lightweight
- Compressible and packable
- Versatile
- Wind resistant
- Construction
- Resilient Coreloftâ„¢ Compact 60 insulation retains loft
- Performance stretch fleece side panels give ventilation
- Light, soft Tyonoâ„¢ 20 is air permeable
- Design & Fit
- Trim fit for base layer or light mid-layer use
- Patterning
- Articulated elbows
- Gusseted underarms for mobility and comfort
- Zippers & Fly Configuration
- No Slip Zipâ„¢ front zipper
- Custom TPU zipper pulls
- Cuff & Sleeves Configuration
- Stretch-knit cuffs
- Improved cuff construction increases durability, eases layering and removal
- Hem Configuration
- Laminated hem
- Dual lower hem adjusters
- Slight drop hem
- Pocket Configuration
- Internal chest pocket with zip
- Two hand pockets with hidden zippers
- Sustainability
- Contains materials that meet the bluesign® criteria
- Dope dyed lining fabric
- Fabric Treatment
- DWR (Durable Water Repellent) finish repels moisture
Specs
- Weight: 345 g / 12.2 oz
- Fit: Trim fit, Hip Length, Centre back length: 74 cm / 29.1 in
- Materials
- Stretch fleece – 94% polyester, 6% elastane
- Tyonoâ„¢ 20 denier shell with DWR treatment – 100% nylon
- Coreloft™ Compact (60 g/m² ) insulation. Highly crimped, multi-denier siliconized polyester yarn that has undergone a special process which reduces the thickness of the material by 50%, without reducing its insulation value by the same amount. Lightweight, breathable, thermally efficient 100% polyester fibre.
- Dope Permeairâ„¢ 20 – 100% nylon
Arc’teryx Men’s Jackets and Tops Sizing
| Body Size: | X-Small | 36 | X-Small | 36 | Medium | 40 | Large | 43 | X-Large | 46 | XX-Large | 50 |
|---|---|---|---|---|---|---|
| Chest (in.): | 36 | 38 | 40 | 43 | 46 | 50 |
| Waist (in.): | 29 | 31 | 33 | 36 | 39 | 43 |
| Hip (in.): | 36 | 38 | 40 | 43 | 46 | 50 |
| Sleeve (in.): | 32 | 33 | 34 | 35 | 36 | 37 |
| Calculate your own body measurements, then select your product size. | ||||||
![]() | How to Find Your Measurements |
|---|---|
| Sleeve: With your arms in a slightly bent position, measure from the center of the back of your neck, along the length of your arm, to the wrist. | |
| Chest/Bust: Measure around your chest/bust, holding the measuring tape under your armpit. | |
| Waist: Measure around your hips at the narrowest part. | |
| Hip: Measure around your hips at the widest part. | |
| Crotch to Ankle: From a standing position, measure from your crotch to your ankle. |












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