Elements heat entire length of each finger and thumb. Comfortable 85/15% Polyester/Lycra® liners fit snugly under existing windproof and waterproof gloves or mitts. Connect to 12V power source; provides 25W of heat and draws 1.8A. For use with GEN X-4 Warm Tek heated jacket liner: no additional hook-ups are required; simply plug directly into the plugs hidden in sleeve ends. Leverages ZEPTO® fibre technology, these heating fibres are so thin, wouldn't be able to notice if not for tremendous heat output. GEN X-3 and GEN X-4 are fully compatible.. Use of a temperature controller is recommended.. Recommended to use these liners under a waterproof glove..