Defeet's Slipstreams are are a solid pair of oversocks (figuratively and literally) and you get to feel just like a seasoned pro of yesteryear by having to manually cut your cleat holes. Whether that's cool or not is a matter of taste.
DeFeet were one of the first to create specific oversocks. Frequently seen covering shoes in the pro peloton, Slipseams must be good – or is it just because money has changed hands?
These oversocks – call them Belgian booties, if you like – are about as simple as they get, adding shoe protection and a little warmth on those days when a full overshoe would be excessive.