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Atom LT Pant


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Atom LT Pant Men's Insulated, wind-resistant pants using Coreloft™ 60 for lightweight, insulative comfort during colder conditions. Ideal during Alpine adventures as an over layer to preserve body heat during periods of low activity. Atom Series: Synthetic insulated mid layers | LT: Lightweight.

Insulated, wind-resistant pants using Coreloft™ 60 for lightweight, insulative comfort during colder conditions. Ideal during Alpine adventures as an over layer to preserve body heat during periods of low activity. Atom Series: Synthetic insulated mid layers | LT: Lightweight.

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XS, S, M, L, XL, XXL
335 g / 11.8 oz
Trim fit
Sizing Chart: 


These Coreloft™ insulated pants are designed to keep you warm on the coldest days, or to be used as an extra outer layer during low activity moments in the mountains.


Arc’teryx-developed Coreloft™ insulation has a very high warmth-to-weight ratio, meaning it delivers great warmth for very little weight and low profile volume. The resilient structure of the insulation resists compacting, so it can be repeatedly stored and returned to full loft. The outer fabric on the Atom LT Pant is weather-resistant, enabling it to function as an outer layer. Full side zips provide ventilation as desired and open pant legs wide when dressing over equipment.


  • Lightweight, resilient Coreloft™ synthetic insulation is compact and warm
  • Outer fabric sheds moisture and blocks wind
  • Full side zipper opening adjusts ventilation, opens wide over equipment
  • Articulation in the seat and knees provides room for layers to move freely
  • Elastic waist


  • Luminara™
  • Coreloft™ 60 insulation (60g/m²)

Learn More About This Product

Arc'teryx Coreloft™ Insulation

Coreloft Fibres Coreloft™ insulation

Developed by Arc'teryx, Coreloft™ is a synthetic insulation made of staple fibres in mixed sizes that are crimped to trap air and retain warmth. Available in different thicknesses for end-use performance and comfort.

Key Advantages

  • Lightweight and highly compressible
  • Durable and resilient
  • Retains its warmth in humid and wet conditions and dries quickly if wet

Arc'teryx Fit Guide - Trim Fit

These trim fitting garments share motion-friendly traits with our Athletic fit, but are patterned with lower volume for reduced bulk. Our trim fit is sized for a base layer and a trim synthetic or down filled mid-layer

To find out how to calculate your body measurements, view our Sizing Charts:

Men's Tops | Men's Bottoms
Women's Tops | Women's Bottoms


Insulated mid layers made with hydrophobic synthetic material that resists absorbing moisture. Outer fabric has a water-repellent finish.

LT | Light Weight

Built with highly durable top performance materials but designed with a streamlined minimalist set of features to provide very light weight.

Full Feature List

Technical Features
  • Breathable
  • Insulated
  • Lightweight
  • Compressible and packable
  • Wind resistant
  • DWR finish (Durable Water Repellent) helps repel water from fabric surface
  • Articulated knees and seat
Zippers & Fly Configuration
  • Laminated wind flap
  • Bottom snap closure on zip
  • Full length separating side zippers to allow removal over boots and crampons
Cuff & Sleeves Configuration
  • Adjustable pant cuff drawcord
Waist & Belt Configuration
  • Elasticized waist
Pocket Configuration
  • Internal stow pocket with attachment point


  • Coreloft™ 60 (60 g/m²) insulation. Made with highly crimped multi-denier siliconized polyester yarn, this lightweight, breathable, and thermally efficient, 100% polyester staple fibre is very compressible and has excellent loft retention.
  • Tyono™ 20 denier shell with DWR treatment - 100% nylon


  • Machine wash in cold water on a gentle cycle
  • Do not bleach
  • Tumble dry on low heat on a delicate setting
  • Do not iron
  • Do not wring
  • Do not dry clean
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