These covers are made from 70mm high density polysterene. It then gets covered with PVC to protect it against water and steam. The inside is strengthened with aluminium struds. Finally it gets covered with either leatherette or pvc canvas. The cover is light enough for a woman to carry around.
The main purpose of the jacuzzi cover is to keep the water clean and to save you on electricity. With the heating process, there is a lot of heat evaporation and water loss. Therefore, a hardcover is a must!