Jackets that keep you running in all seasons have to protect you from the rain and wind while staying lightweight and packable if the weather changes during your run. These garments have specific tailoring to ensure your movements are not restricted and prevent any abrasion or rubbing. When buying a running jacket, it is essential to consider how you will use it in your layer system. Some jackets come with insulation and some are minimal shells designed to be used with base and mid-layers.