Overheating is for cars. Move fast and stay cool with the Thru Hiker. It's made with eVent, which testers generally agree is the most breathable of all the waterproof-breathable fabrics on the market today (and there are dozens). It's also one of the most expensivewhich is why this pared-down shell sports a dressed-up price tag. But if you're a furnace on the trail (you know who you are), it's worth it. 11 oz (M); integraldesigns.comBonus: A long cut keeps your butt dry when you're wearing a pack.Bummer: You can snap the hood down when it's not in use, but it still flops around.