We recommend if you would like to extend the life of your cover for up to 10 years, you can purchase the Tonneau cover to be placed over your hard cover. The Tonneau Soft Cover will protect your cover from the sunís harsh UV rays and from heavy precipitation. The Tonneau Soft Coverís internal inflatable air bladder offers a slope for rainwater runoff and increases insulation. And thereís no Styrofoam core to absorb rainwater and break! Protect your hard cover with the Tonneau Soft Cover.