Castelli Aria Shell 2 Jacket Wind stopped. Breathability intact. Jersey pocket ready. The problem with most wind jackets is a simple one: they work too well or not well enough. Either they block airflow entirely and you're baking inside a plastic bag, or the mesh is so open that cold air finds its way through anyway. The Aria Shell 2 takes a different approach. The front and back use an ultralight woven windproof microfiber that shields against cold air while keeping weight to a minimum. The side panels and back-of-sleeve striped elastic mesh enhance breathability and keep the jacket close to the body, preventing fabric from flapping during pedaling. The fit is race-cut but the stretch panels make it feel like a base layer, not a shell. Its extreme compressibility means it folds into its integrated pouch and tucks into a jersey pocket or saddle bag without taking up meaningful space. That's the detail that earns it a permanent spot in the kit bag: a wind jacket you'll actually carry. Ultralight windproof woven microfiber body blocks wind across the front and back without adding noticeable weight to the ride Striped elastic mesh side panels and back-of-sleeve inserts keep airflow moving where you generate the most heat, so you stay comfortable across a wide effort range Tailored race fit with stretch construction sits flush against a jersey or base layer with no bagging or cold-air pockets at the cuffs and hem Integrated stuff pouch packs the entire jacket into a bundle small enough for a back jersey pocket, making it realistic to carry on every ride YKK Vislon two-way zipper lets you dial ventilation on the fly without stopping to adjust layers Reflective Castelli logos add visibility at dusk and dawn without disrupting the clean, minimal aesthetic | Castelli | Aria Shell 2 Jacket Men's | Size Large In Clay