Which leads to the point that cold weather shoes really need to be non ventilated (most cycling
shoes have a generous set of vents where the body of the shoe is perforated and covered with
an open weave cloth that lets in blasts of cold air) and over sized enough to allow a thicker
set of socks to be worn. Hasten to the usual websites for shoe covers. I find the toe booties
good for rides of 3-4 hours down to 40F or so, where it is likely to warm up in the course of the
ride. For temps in the 30-34F range full shoe covers are a better idea. I don't ride cooler than
that so don't know their lower limits. Full shoe covers come in cloth and in neoprene with the
latter a good bit warmer. Sizes on the shoe covers are a bit misleading: buy one at least 2 sizes
larger than your shoe size. My neoprenes take 5-10min to wrestle in place on 45 sized shoes and
are XLs for 48 sized shoes. Expect to cut a hole for the cleats.