Abstract: A heated sock (14 or 16 of FIG. 1) for keeping the wearer's foot warm in a cold environment and including a resistive heating unit (10 or 12) secured in two of the socks, a battery source (76 FIG. 2) having first (78) and second (80) terminals and which is carried on the wearer's body, and switches (36 and 64) controllable by the wearer for acting in combination with the resistive heating unit (10 or 12) to selectively cause different and controllable amounts of electric current from the battery source (76) to flow through the resistive heating unit (10 or 12) to thereby generate different and desired amounts of heat in the sock (14 or 16).