400 Micron Blue Solar Pool Blanket Designed to cope with harsh weather conditions of Australia. It offers the highest quality, longevity and value for money in bubble material. Maximum durability against effects of Sun, Salt and Chlorine. These pool covers are suitable for any in ground or above ground of any shape. Manufactured in the UK. A key feature is the bubble shape and size. The reduced height but greater diameter of the larger than standard bubbles make this material more effective as an insulator because the greater air space in the bubble lets less heat out of the pool which means that the water stays warmer for longer. Further, the use of pale, translucent colours allows maximum penetration of short wavelength solar energy - this energy radiates within the pool at longer wavelengths; the larger surface area of the bubble is more effective at trapping these waves within the pool, potentially increasing a pools temperature by up to 8 deg C.