Wore this on a chilly morning hike and it was exactly the right amount of warmth without overheating once the sun came out. The lightweight fabric packs down small enough to stuff in my pack, and the thumbholes are a nice touch on windy ridgelines.
The hood fits snugly under my climbing helmet without bunching, which is rare for a lightweight layer. It packs down to nothing in my daypack, and the thumbholes actually stay put when I'm reaching for holds. Shoulder season layering sorted.