This 18 ft round solar pool cover fits the popular 15-18 ft family and starter above-ground pool footprint—right-sized for recreational pool owners without dragging unused cover material like 24-27 ft covers leave trailing off a smaller pool perimeter. 14.11 lbs / 6.4 kg light weight suits single-person handling by first-time pool owners, renters, and casual users who fold and store the cover themselves without investing in a reel system—the 15-minute daily on/off cycle a recreational pool needs stays manageable solo. 12 mil PE mid-gauge thickness balances cost and durability for the family-pool owner: thicker than 8 mil bargain covers that crack at the bubble seams by year 2, lighter and cheaper than 16 mil heavy-duty covers that a smaller pool doesn't need the extra weight of. Reduces water evaporation by up to 95%, cutting the refill cycles on a smaller pool that evaporates proportionally faster per unit volume than larger pools. Dense micro-bubbles absorb sunlight during the day to warm the pool and retain heat overnight, extending shoulder-season swim days. PE resists UV, stretching, tearing. Trim with scissors for irregular pool shapes or ladder cutouts for custom fit. Blocks debris, leaves, small animals, and airborne dust. Note: avoid highly acidic environments or post-shock chlorination use (24-48 hr wait). Thickness 12 mil; color blue; dims ø18 ft / ø5486 mm; PE; net 14.11 lbs / 6.4 kg; model 300-18.