It can be chilly out on the hill early in the morning. Better take a fleece, just in case. The Womens Performance Flex Jacket from Jack Wolfskin is super breathable and the shoulders are reinforced with robust, stretchy Flex Shield fabric. It is a functional, basic jacket for active outdoor fans. It offers the light thermal insulation you need when you're trekking or jogging and is ideal for cool summer evenings around the campfire. The stretch fabric on the shoulders provides improved mobility. It's tough enough to cope with the extra wear and tear when you're carrying a pack and has wind and water resistant properties.