Don't get cold feet, let the Gerbing Heated Clothing Heated Sock Liners keep them warm while you ride. Your toes will stay nice and toasty with top to bottom heating elements than can reach up to 135°F.; Stretch lycra construction Connects to Gerbing Heated Clothing heated pant liners Hand washable Moisture wicking Anti-bacterial Reaches up to 135°F 12v DC 1.14 amps Battery Harness, Y-Harness & temperature controller required for stand-alone operation (sold separately)