20x40ft 300µm 14mil Pool Solar Cover for Inground and above-Ground Swimming Pool

The Solar Pool Cover is made of PE material. The transparent blue cover absorbs heat through thousands of bubbles during the day and releases heat into the pool, thus allowing for longer swimming time. Let you enjoy a pleasant swimming time! Notice: bubble side is down when use, normal the bubble will be a little deflated before sun exposure due to the principle of thermal expansion and contraction.