Acculok offers hot tub covers that are supposed to be 400% more effective as water vapor barriers than traditional covers. The Acculok cover comes with a plastic sealed foam core. The 7-inch seamless heat shield surrounds the spa to minimize heat loss including the center fold. There are four locking tie-down straps that hold the cover in place and tight to the spa cabinet. Acculok covers are backed by a 7 year warranty. For more information call (954) 735-9800 or go to www.acculokhottubcovers.com.