Bike shoes are generally super breathable, which is great, in the summer. When it gets cold out, breathable kinda sucks. I went to the bike store looking for a solution for riding to work in the cold. I wasn't sure if I was going to walk out with a new pair of bike shoes or just something to put over my existing shoes. I left with Performance Neoprene bike shoe covers.
Performance Neoprene Bootie
For just under $40 my feet are ready to go for cold weather. And I have given these booties a true test for North Carolina. With two morning rides starting out at about 16°F, I can honestly say these booties were enough, with prewarmed wool socks, to keep my feet warmish for an hour-long ride.