When you need more than a top, grab a running jacket. For the summer, you’ll find extremely light versions which are very breathable, wind and water-repellent, weigh under 100 grams and pack-down so small they fit into a trouser pocket. For colder seasons that bring rain and snow, you’ll find versatile running jackets with wind and waterproof outers and soft, warming inner linings. Some feature mesh inserts or ventilation openings for improved breathability and more effective moisture management. If there’s a hood on the jacket, it should be possible to close it tightly with a drawstring – so it won’t be blown off your head during your run.