Our closest fitting most lightweight and packable waterproof rain jacket stands up to rain and wind without slowing you down the pro aero wxb jacket is both waterproof and highly breathable with a contoured race fit in the sleeves and body areas so it won39t leave you flapping in the wind pack it in your jersey pocket where it39ll be ready to pull on over any kit for emergency rain protection lightweight packable protection from water and wind with maximal breathability just w