Incredibly compact and lightweight, the Oakley Men's Jawbreaker Road Vest easily fits in your rear jersey pocket, so you can bust it out at a moment's notice when additional protection from passing showers and breezy conditions is needed. It's designed with an incredibly thin fabric that's beads off oncoming showers and blocks breezes, but without adding unnecessary bulk. Breathable panels sit just beneath your arms, preventing excessive perspiration on long climbs and spirited training rides when your heart rate zones are constantly elevated. Oakley lines it with a gridded polyester fabric along the upper back to wick moisture where it can readily evaporate. It's finished with a form-fitting cut and dropped rear hemline that conforms to your body position while you're riding aggressively in the drops.