The Castelli Riparo Rain Jacket is the cycling rain jacket for the rider who needs complete waterproof protection without the weight and bulk of a heavy rain jacket. A waterproof polyurethane membrane is added on top of the 2.5 Layer Torrent IV fabric, a durable woven outer shell. Through intensive testing, polyurethane membrane has shown to completely block out rain with its 10,000 MVTR rating. The Torrent fabric blocks out cool wind. Combined, elements that make a bike ride very unpleasant---wind and rain. Extra protection is added with seamed seals and a waterproof zipper. The high neck and a long tail provide protection against road spray at the neck and on the rear. Weighing only 110 grams, the Riparo packs up very small and when placed into a stuff packet is can be easily stored in the back jersey pocket. You can stuff this Castelli rain jacket as a back-up in case of rain and you can store it away when the rain has cleared up. All these features make the Riparo Rain Jacket incomparable as protection against rain for the athlete who needs to feel light and mobile on his bike.