Above-Ground Pool Covers. Specially designed for long wear and protection against falling leaves and other debris that can get into your pool. 3-ply thick, woven polyethylene covers are coated on top and have dark undersides to help prevent algae growth. Heavy-duty edging and aluminum grommets provide years of wear. Standard covers feature an 8 x 8 weave. Deluxe covers have tight 12 x 12 weave.