Wore this vest over a fleece on a breezy 40-degree morning and my core stayed warm the whole hike without overheating once the sun came out. It stuffs down small enough to clip onto my pack, which is why it's basically lived in my daypack all shoulder season.
Wore this vest on a chilly morning fishing trip and it kept my core warm without overheating once the sun came up. The down packs down small enough to stuff in my daypack, which is exactly what I wanted for shoulder season.