Arc'teryx Cerium Jacket 2027 – Women's Insulator

The Arc'teryx Cerium 2027 is a technical insulating mid-layer built for women who venture into the backcountry. Whether you're pushing hard on the ascent or layering up at a wind-exposed belay, it bridges the gap between active warmth and packable versatility in genuinely cold alpine conditions.

At its core, Down Composite Mapping™ combines 850-fill European white goose down — certified to the Responsible Down Standard — with Coreloft™ synthetic insulation placed strategically in moisture-prone zones, so you stay warm even when conditions get damp. The recycled 15D Arato™ nylon shell is dope-dyed for colour consistency, treated with an FC0 DWR finish (PFAS-free), and articulated throughout for full freedom of movement. A high collar adds critical face-level warmth, and a reverse coil centre-front zipper keeps the profile clean and low-snag.

This jacket is ideal for backcountry missions and alpine climbers who need a compressible layer that earns its place in a pack. It fits equally well under a hardshell on cold summit days or as a standalone piece during rest stops. If you're serious about warmth-to-weight ratio and don't want to compromise on sustainability, the Cerium is a natural choice.

• Is the Cerium waterproof? No — it features a moisture-resistant, PFAS-free DWR-treated shell that repels light moisture, but it is not a waterproof jacket. It's designed to be worn under a shell in wet conditions.
• Does it pack down small enough to carry in a pack? Yes — it comes with a mini stuff sack with a drawcord closure, and the 15D shell compresses to a very packable volume for its warmth level.