Before setting out on a ride on a mild to cool temperature day, we zip up the Castelli Espresso Vest over our short or long-sleeve jersey for added warmth and protection. The front fabric is designed to block out the wind while remaining breathable, while the Air_O stretch fabric on the sides and back keeps us comfortable with a perfect fit. Not to mention there's plenty of pocket space to store our phones, snacks, or tools, ensuring we can reach our essentials without having to reach underneath our vest.