The is made from Gore-Tex® Shakedry™ technology, an innovative fabric construction that eliminates the textile on the outer face of the fabric, resulting in a 2 layer fabric that's lighter and doesn’t absorb moisture on the outer face. This means that the water rolls off and you stay drier, and it packs away in sizes that were impossible until now Castelli’s take on this new technology is made for cyclists seeking maximum performance. Now you don’t have to choose between a small or protective jacket to carry with you. The anatomic fit has been optimised for a performance riding position, meaning it will prevent the jacket from billowing and slowing you down The easy-sliding waterproof YKK® Vislon® zipper, elastic bindings on the cuffs and hem to keep the jacket in place, a zipped opening on the back to access your jersey pockets, extra ventilation and reflective elements on the jacket to help keep you visible in low-light conditions are just some of the functional features of this jacket Even with fully taped seams, the Idro Jacket weighs a mere 123g (size large) and folds down to fit in half a jersey pocket, so you’ll never have an excuse for leaving it behind. When the rain starts you have full Gore-Tex® “Guaranteed to Keep You Dry” protection Features:The lightest Castelli GORE-TEX® product ever madeDurably waterproof and long-lasting weather protection backed by the GUARANTEED TO KEEP YOU DRY™ promiseGore-Tex® Shakedry™ product technologyFolds into just half a pocketYKK® waterproof Vislon® zipperZipped opening for access to pocketsAnatomic wrist closureReflective seam tapingBuy Castelli Clothing from Chain Reaction Cycles, the World's Largest Online Bike Store.