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.