While many companies offer tights with a water-repellent finish, Castelli takes it a step further with the Tutto Nano Bib Tights. They use nanotechnology to give the fabric a mechanical repellency to water, which helps you stay drier and more comfortable than a standard DWR finish. Don't think of them as just a niche rain tight though, as the fabric breathes well when you're working hard in dry conditions too, and the reduced seam count makes them comfortable for long days in the saddle.