Looking for the best window treatments and coverings in the Kingsport area? You've found them! At Sunburst Shutters Tri-Cities, we offer the best value in window treatment products - especially when it comes to shutters (wood, faux wood, reclaimed wood, sliding barn door). Our Polywood shutters are the best-selling shutter in America. Not only are they energy efficient and durable, they're also easy to adjust and make for beautiful, modern window coverings.