Gyde S4 Men's Heated Gloves S3 Slimline Coreheat7 System combines strong 7V Lithium-Ion battery pack with Microwire technology Deliver heat for up to 8 hours of heat at a time depending on heat setting Insulated lightweight, stretchable construction and featurr a breathable AQUATEX water-resistant membrane for comfort Reinforced layers in the fingertips for extra grip and a touchscreen compatible index finger