The Atom Jacket delivers dependable, breathable warmth for alpine dawn starts, cold summit pushes or unexpected squalls. Light but durable, it’s built with synthetic Coreloft™ insulation that holds loft even after years of wear. Stretch‑fleece side panels move with you and vent heat when activity picks up, perfect for hiking, climbing or mountaineering.

It layers neatly under a hardshell for extended back‑country days, yet functions comfortably as a standalone jacket on chilly autumn mornings. The wind and moisture‑resistant outer fabric, treated with a PFAS‑free DWR finish, gives you weather resistance without excess bulk. Two zipped hand‑pockets and an internal chest pocket keep essentials secure, and dual hem adjusters seal out drafts when you pause on the trail.

Whether you’re heading up a ridge, navigating damp forest tracks or lounging around camp, the Atom balances warmth, mobility and versatility, a reliable companion for a wide range of adventures.

What's been updated: Updated with recycled Coreloft™ insulation and DWR (Durable Water Repellent) free from intentionally added PFAS.

Features

• Resilient Coreloft™ Compact 60 insulation is breathable, warm, and light, performs if wet, and delivers loft retention that resists packing out
  
• Light, soft Tyono™ 20 is air permeable
  
• Performance stretch fleece side panels give ventilation
  
• DWR (Durable Water Repellent) finish repels moisture
  
• Mid-height collar is insulated and fleece-lined, perfect for layering
  
• Stretch-knit cuffs
  
• Cuff construction increases durability, eases layering and removal
  
• Dual lower hem adjusters
  
• Drop back hem
  
• Laminated hem
  
• Two hand pockets with hidden zippers
  
• Internal chest pocket with zip
  
• No Slip Zip™ front zipper
  
• Custom TPU zipper pulls
  
• Contains materials that meet the bluesign® criteria
  
• Dope dyed lining fabric