I use chemical toe warmers ($2 for 2pr. at Wal-Mart), smartwool sox, and shoe covers (not booties). Works great. The toe warmers are good for about 6 hours, so after your ride, put them in a ziploc bag, then into a tupperware, and they will deactivate, then you can re-use them. I get 2-3 rides out of mine, depending on the length of the rides of course. Even at only 2 rides per pair, that's only $0.50 a ride, a small price to pay for warm feet.