This jacket seems intriguing. It's fairly light from picking it up (maddenly, REI often leaves off the weight in their specs on the website!), mostly made of eVent, but has a meshy-type fabric running from around the armpit down on the side, which I assume would breathe fabulously. I almost bought one today, ($169), had it in my hands, but decided against it because it didn't have a hood. Still, intriguing.
