Selling because it's too small for me now. It's an awesome jacket. Very cozy down to 35F. Colder, you will need to layer. Packs into its own pocket, which is great for travel. Cerium Hoody The Cerium is a go-to for virtually any alpine undertaking. Taking it higher, we refined the design and sourced more sustainable materials while maintaining its exceptional warmth-to-weight ratio and packability. Responsibly-sourced 850 fill down – with Coreloft™ synthetic utilized in areas prone to moisture – provides premium insulation. The outer, recycled 15D Arato™ nylon with dope-dyed yarns, is light and durable. An insulated StormHood™ extends the warmth, and the streamlined ergonomic fit layers easily.