The Sealskinz Road Thin Mid socks are completely waterproof, windproof, and have good breathability. This makes these socks perfect for high intensity rides in the winter when it can be cold and wet. Thanks to the Merino wool your socks don’t get damp and cold.
The waterproof properties mean that, despite the excellent breathability, your feet can sweat a little sooner. This often causes people to think that their socks aren't waterproof at first, but you'd be mistaken: they're completely waterproof.