The Castelli Aria Vest employs stretch and microfibre fabrics, offering a welcome update on a classic piece of cycling apparel: the wind vest.The vest completely blocks wind on the front while allowing breathability on the back. The rear panel’s stretch material means that the vest sits tight to the body without being restrictive. As this is an item that will likely be taken off once it warms up or will be stowed ready for cresting summits and flying down long descents, Castelli has made it packable. The vest packs into its own rear pocket and at 75g takes up hardly any room in a jersey pocket.Please note our shell jackets are designed to fit over summer clothing only, if you wish to purchase a waterproof jacket for use over winter clothing, please size up. Otherwise, select your Castelli jacket in the same size as you would select a jersey.Key Features: Ultralight windproof vestStriped mesh back is stretchy to avoid flapping in the windPacks small into its own rear pocketRear pocketYKK vision zipperReflective detailingTemperature comfort range of 12° – 20°cWeight 75g (large)