Castelli Size Chart Castelli put a lot of thought and engineering into the high-performance Superleggera Shell Jacket. The main body fabric is Japanese-made Pertex(R) Quantum, but 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 wind and light rain at bay. The back uses a totally waterproof stretch panel that sheds 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. Features: - Pertex(R) Quantum base fabric with low air permeability to keep you dry - Stretch Torrent waterproof fabric insert on back - Extremely packable - YKK(R) Vislon zipper - Front and rear reflectivity - Weight: 87g - Main fabric: 100% polyamide - Rear inserts and under sleeves: 100% polyester - Cuffs: 64% polyester, 36% elastane