Designed for light weight and easy carry, Castelli's Sottile Due Shorty Jacket is the most packable jacket in its lineup. Stuff it in a jersey pocket when the weather looks sketchy, and it will be right there when the sky opens up.The Sottile Due Shorty Jacket is made from a semi transparent, slightly stretchable fabric that is rated at 10,000 mm of waterproofness, is wind resistant, and is highly breathable. And in case you're wondering, this rating means that a 10,000mm fabric will repel a column of water up to 10,000mm in height, or about 32 feet. In more relatable terms, this jacket provides nearly the same waterproofness as a typical pair of ski pants. In terms of fit, the Sottile Due has a sleek, race inspired cut with both an extended collar down and a wheel spray deflecting elongated rear. Mesh at the underarms allows cooling air to flow through the jacket, and it has a generously sized single zip on the right side that provides easy access to your jersey pockets. The days of fussing with your vest to reach your rear pockets are over. For an increased visibility to motorists in low light conditions, Castelli has also added reflective elements throughout the jacket. The Castelli Sottile Due Shorty Jacket is available in six sizes from Small to XXX Large and in the colors Yellow Fluo and Transparent. Please note that Castelli estimates a useful temperature range of about 50 to 64 degrees Fahrenheit for this jacket.