Cycling often involves varying climates and conditions throughout a ride. Your body also experiences temperature fluctuations as you transition from climbing to descending. To say cycling jackets need to be versatile is an understatement. The Gore Bike Wear Phantom SO Jacket uses smart features like removable sleeves and Windstopper technology to keep your core protected and comfortable on early- or late-season rides.The Windstopper soft shell fabric is a single-layer laminate that's similar to Gore-Tex, but instead of being fully waterproof, it favors wind protection and breathability. This offers excellent comfort during cool-weather, highly aerobic activities. The shell is treated with a DWR (Durable Water Repellent) coating for protection from light drizzles or road spray -- if you're looking for waterproofness, then check out jackets equipped with the Gore-Tex membrane . Windstopper shines on cold rides when you plan on going hard and perspiring heavily. The fabric is soft against exposed arms, and quickly pulls perspiration from a baselayer and your skin. This keeps your core dry and helps the body regulate temperature so you can ride at max output without overheating or suffering from biting headwinds.A jacket's material is one contributing factor to its ability to offer user comfort, but it's not the only one. Gore Bike Wear goes to great lengths to ensure that the fit is precise and function is intuitive and simple to use while riding. You'll find the Phantom Jacket to have a slim, performance-oriented fit to prevent flapping in the wind, but you won't find it restrictive. Gore added stretch inserts for freedom of movement, no matter where you find yourself positioned on the bicycle.The Phantom's detachable, articulated sleeves also add to on-the-bike comfort by providing full coverage when stretched out in the drops. The best part is you can easily remove the sleeves, via a zip, and stash them in the slanted, easy-to-access side pockets. This is invaluable to offering the most versatility without adding weight, complexity, and gear to your ride (i.e. arm warmers).Gore Bike Wear provided the Phantom SO Jacket with reflective logos and print on the front, back, sleeves, and sides for 360 degrees of low-light safety. The hem features elastic to prevent migration, and the front zip has a storm flap to lockout cold wind. It's available in Black, Black and White, Lemon, Neon Yellow, Pool Blue, Red, and White. The Phantom comes in sizes Small through XX-Large.