Diameter: 38cm/15inch WARM RIDE - The heated cover provides a comfortable warm ride during freezing winter. Use this heated cover in your vehicle to enjoy a more relaxing drive during the frigid winter weathers. Simply plug it into your 12V cigarette lighter adapter and watch it do its work by providing warmth relief and comfort simultaneously. BREATHABLE LAYER - The heated cover has an ability to circulate air through the hundreds of tiny spaces in the microfiber and mesh materials. Instead of pockets of cold air turning your steering wheel into a block of ice, this seat heater puts a toasty breathable layer between your hands and your wheel. The warm air flow from the cover maintains body heat providing a more comfortable ride during the cold winter weathers. MUST HAVE - The heated cover is a must have makes a great and thoughtful gift for constant travelers, taxicabs, carpoolers, and people living in colder climates or any car owner. Furthermore they enhance the appearance of your steering wheel and cover. PREMIUM QUALITY - The heated cover is constructed out of premium quality to provide a most durable, strong and long lasting seat heater. It will last you throughout the winter and for many years to come.