Lay-Z-Spa EnergySense square thermal cover 1.80 m x 1.80 m x 71 cm Compatible with square spas up to 1.80 m x 1.80 m x 71 cm Insulates your spa with a double layer of thermal protection, making it 40% more energy-efficient DuraPlus waterproof surface material is tough and stands up to the elements and regular use Includes zip opening for built-in pump or connection to an external pump Contents: 1 thermal spa cover Increases spa's energy efficiency DuraPlus waterproof surface material increases cover's durability Zip opening for built-in pump or external pump connection Compatible with square spas up to 1.80 m x 1.80 m x 71 cm Contents: 1 thermal cover