This 33 ft. round solar pool cover is sized right for standard 30 ft. round above-ground pools with a little margin for drape and fit, using an 8 mil PE bubble construction that trades a bit of thickness for easier handling, lighter roll-up, and a gentler price compared with 12 mil covers. Micro air bubbles still create the same insulating layer that absorbs daytime sun and releases it into the pool into evening hours, extending swim hours on cooler nights and pulling the season out on both ends of summer. Durable PE material resists stretching, tearing, and chlorine exposure, holding up through multi-season outdoor use, and up to 95 percent reduction in water evaporation means fewer refills and steadier chemistry between treatments. As a real-world bonus, the cover also blocks leaves, insects, and small animals, making Monday morning cleanup a short skim instead of a thirty-minute net session. The lightweight 8 mil build rolls up easily before a swim, faster to pull back than heavier covers. Color: Blue.