Gore Bike Wear's Phantom 2. 0 SO jacket is consistently one of our best selling winter cycling jackets. Why' In a word, versatility. Gore's WindStopper membrane, sandwiched between two layers of fabric, makes riding in cold air pretty much like riding in less cold air. It blocks the chilly air from entering the jacket, which allows your core to heat the inside of the jacket. And, if the day's not all that chilly, zip the sleeves off. One of our favorite things about the Phantom is the short sleeve version. It's ideal for those shoulder season days where full sleeves are too much, but a baselayer and jersey isn't enough.