I'll be honest. I haven't tried this yet but I'm hearing great things.
FUTURELIGHT is The North Face's new proprietary jacket tech that is supposed to be super lightweight, breathable, and waterproof.
Here's the marketing pitch:
"For the first time ever, we’ve added air permeability to a waterproof membrane. The nano structure of the FUTURELIGHT™ membrane allows air to pass through for better venting and breathability without sacrificing waterproofness and durability."