So lightweight it feels like wearing nothing and packed with features (and fully packable in it's own chest pocket), the Weather Jacket from On offers the protection you need on wet and wild runs. Every element of the Weather Jacket is made with the practicalities of running in the elements in mind. The cap-design of the jacket's hood keeps it in place in the wind. The pockets of the Weather Jacket offer water-resistant zip protection for your valuables. And with its 4-way stretch Japanese fabrics, the Weather Jacket offers 360° ventilation in a feather weight package that's also tear proof and fast drying.