Trying to stay dry when you're riding in the rain is generally a losing proposition, but the Tempesta Race Jacket is Castelli's attempt at making cycling rain gear that actually works. While the design isn't radically different than most rain jackets out there the back hem is significantly longer than the front, and there's some extra fabric at the sleeves and back the new, and highly technical, eVent waterproof and breathable membrane keeps moisture out without causing clammy sweat to build up.
EVent is also used in top-end mountaineering shells and rain jackets, so you know its weather-besting credentials are impeccable, but its low weight and supreme packability are what elevate it above other materials. Even with fully taped seams, the Tempesta weighs in at just 201g and stuffs easily into a jersey pocket, so you'll never have an excuse for leaving it behind. Additional water-defeating details include a waterproof zipper, drawstring wrist closures, and an elastic silicone waistband, all of which help the Tempesta maintain its marvelous impenetrability. Stretchy inserts at the elbows, shoulders, and sides mean you'll have uninhibited mobility even when you're armored up against the weather. Castelli finishes the Tempesta with two classic back pockets and reflective details.