TourMaster Synergy 2.0 Electric Heated Leather Gloves (4X-Large, Black) Grade A, Aniline drum-dyed goatskin leather with a Rain guard waterproof and breathable barrier Clarino palm panel resists grip wear, 100gm Polyfill insulation increases warmth and heat retention; lightweight and flexible steel fiber heating elements provide instant and even heat A single rheostat is included and easily and accurately adjusts through a range of temperatures Soft Bremberg interior lining Action Expansion panels in the fingers help fine-tune the fit and increase comfort