Road bike jackets are thin, lightweight waterproof and windproof layers designed to let you ride all winter in comfort. Most are close-cut, so there is no extra material flapping around and creating drag, and since most road racers don’t use backpacks they do not come with any extra shoulder pads of reinforcement. These jackets can be packed down very small when not in use, and many come with an integrated stuff sack to keep them neat and tidy. These jackets are perfect as a top layer to keep the wind out on dry days, or as a waterproof layer to deal with showers and some top-end models are designed to withstand all-day downpours and still keep you dry and warm.