Helium II Jacket
Accidentally posted this as a comment on Beth's review, and want to repost properly:
I picked up a Helium II jacket to replace an old Patagonia wind-shirt that was only minimally water resistant even when it was brand new. This jacket weight is in the same class, packs down as small, is equally wind-resistant and superiorly water-resistant and durable. It's quickly become my go-to piece for weight-conscious, endurance events where I may need wind or water protection, and can't afford not to bring it. I'm 6'1", 185lbs, and the Large fits me well without being too tight.
IFMGA Mountain Guide
OR Grassroots Athlete