Keep your core warm with the On Weather Vest. Don’t let a little bit of cold weather stop your workout momentum. This vest is the perfect layer to give you some insulation from the elements. Plus, it packs into its own pocket, so it’s easy to throw into a hydration pack or gym bag. Details Lightweight to let you focus on the run Insulated front panel Overlapped construction in the back for added airflow The perfect fit thanks to smart elastic Reflective details for running in the dark Smart packable design