The Castelli Women’s Tutto Nano Tight. Castelli’s Nano Flex 3G fabric is the result of a decade of development. It’s their best all-around fabric for winter tights warm stretchy luxuriously soft highly breathable and on top of that it features Castelli’s proprietary third generation of nanotechnology water-repellent finish. You stay drier and more comfortable. Even though this tight features Castelli’s latest water-repellency technology don’t think of it as just a niche rain tight. The fabric makes for a great dry-weather tight and the reduced-seam anatomical cut makes it extremely comfortable. Reduced seaming for improved comfort and fit. KISS Air2 Donna seat pad for long-distance comfort. Embossed logos for durability. Weight 260 g.