The isothermal cover is made of a special foil with a thickness of 400 microns. It is placed with the bubbles on the surface of the water. It is cut to the inside size of the pool. Its use reduces pool maintenance costs, retains heat and prevents cooling even at night. They also keep the pool water clean. Summer covers are extremely light, so putting them on at night and taking them off in the morning is easy. Summer pool covers are made of translucent materials that allow the sun's energy to pass through, but are also strong enough not to be pierced by twigs falling on them. Often, summer covers are equipped with air bubbles that allow the cover to stay on the surface of the water. In this way, the efficiency of heating by the sun's rays is increased. In addition, summer covers are also a good insulator, preventing heat from the water from escaping into the atmosphere, increasing your energy efficiency. So without heaters, on a warm sunny day you have a pool with a pleasant water temperature, ready to use!