Performing as midlayer and standalone across a broad range of activities and output levels, the iconic Atom LT is an Arc‘teryx mainstay. Over time, we have refined the design to elevate performance, improve durability and extend its versatility. Its Coreloft™ Compact insulation retains heat when wet and withstands repeated packing and unpacking. Light, soft and durable, the 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
- Wind resistant
- Construction
- Resilient Coreloft™ Compact 60 insulation retains loft
- Performance stretch fleece side panels give ventilation
- Light, soft Tyono™ 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
- Collar Configuration
- Mid-height collar is insulated and fleece-lined, layers well
- Zippers & Fly Configuration
- No Slip Zip™ front zipper
- Custom TPU zipper pulls
- Cuff & Sleeves Configuration
- Stretch-knit cuffs
- Improved cuff construction increases durability, eases layering and removal
- Hem Configuration
- Drop back hem
- Laminated hem
- Dual lower hem adjusters
- Pocket Configuration
- Two hand pockets with hidden zippers
- Internal chest pocket with zip
- Sustainability
- Dope dyed lining fabric
- Contains materials that meet the bluesign® criteria
- Fabric Treatment
- DWR (Durable Water Repellent) finish repels moisture
Specs
- Weight: 290 g / 10.2 oz
- Fit: Trim fit, Hip Length, Centre back length: 67 cm / 26 in
- Materials
- Tyono™ 20 denier shell with DWR treatment – 100% nylon
- Stretch fleece – 94% polyester, 6% elastane
- Dope Permeair™ 20 – 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.
Arc’teryx Women’s Jackets and Tops Sizing
| Size: | XS | 0-2 | S | 4-6 | M | 8-10 | L | 12-14 | XL | 16-18 |
|---|---|---|---|---|---|
| Chest (in): | 33 | 35 | 37 | 40 | 44 |
| Waist (in): | 25 | 27 | 29 | 32 | 36 |
| Hip (in): | 36 | 38 | 40 | 43 | 47 |
| Sleeve length (in): | 29.5 | 30.5 | 31.5 | 32.5 | 33.5 |
![]() | 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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