CedarBoards XL insulated vinyl siding is 16 feet 8 inches long and comes in a double 6-inch clapboard profile. Molded from real cedar boards and backed with extruded polystyrene insulation, the siding can increase the R-value of a home's exterior by up to 22 percent, the maker says. It comes in 12 low-gloss colors with a limited lifetime warranty and lifetime fade protection. A variety of coordinating trim and accessories is available. 800-233-8990. www.certainteed.com.