GMC Sonoma Hard Tonneau Covers not only secure your Sonoma, they save on trips to the pump. When your truck bed is open, it causes wind drag, making your truck work harder on the road. But, your GMC Sonoma Hard Tonneau Cover closes your bed for increased aerodynamics. Now, you can drive with less wind drag and raise your MPG. What's more, your Sonoma tonneau's line adds a sleek look. Enhance the style and utility of your truck with a GMC Sonoma Hard Tonneau Cover.