The TheraPureSpa Ground Cover provides added protection for your spa from ground elements such as rocks, roots, and dirt. The 20 millimeter cover is lined with an air-filled bubble system for added cushioning. * Protects your spa from rocks, roots, and dirt * Cover is lined with air filled bubble system * Provides added cushioning to your spa * Helps prolong the life of your spa * Dimensions: 78L x 78W x 78H inches