Superlight ProtectionA lot of thought was put into the high-performance Castelli Women’s Superleggera Vest. The main body fabric is Japanese-made Pertex® Quantum, but they’ve made it without the standard coating so that you get a very small amount of air permeability that lets sweat escape, while the DWR coating will keep light rain at bay. On the back they’ve used a totally waterproof stretch panel that shed wheel spray, and the stretch allows for a great close-to-body fit. Best of all, the piece takes up minimal space in a jersey pocket. The vest has mesh panels for extra breathability.