The Arc'teryx Cerium combines lightweight design and compact packability with reliable thermal insulation. Responsibly sourced 850-cu-in down is paired with synthetic Coreloft in moisture-prone areas, while recycled 15D Arato nylon provides a lightweight and durable outer shell. The insulated StormHood and bio-based lining round out the redesigned construction. With Down Composite Mapping, synthetic insulation is strategically placed in areas where moisture can accumulate, while the down fill in other areas ensures maximum warmth.

# - European white goose down with a fill power of 850 cuin provides an exceptional warmth-to-weight ratio
- Recycled 15D Arato outer fabric is lightweight, durable, and solution-dyed
- Down-proof 20D Arato plant-based lining is exceptionally lightweight
- Elastic cuffs
- FC0-DWR (DWR-treated) fabric is water-repellent
- Adjustable drawcord at the hem keeps drafts out
- Stuff sack included
- Pre-shaped cut for maximum freedom of movement
- Two zippered side pockets
- Internal zippered security pocket
- TPU zipper sliders are quiet and easy to grip
- Reverse spiral zipper on the front for improved durability and a slim profile