Blue Wave Silver 12-Year Round Above Ground Pool Winter Cover offers long-lasting protection engineered specifically for round above-ground pools. Made from durable polyethylene with a 10x10 scrim count, this pool winter cover is built to resist tears, fraying, and harsh weather. It features a full 4-foot overlap that ensures a snug, reliable fit over the pool's edges. Heat-sealed seams add to the cover's integrity, helping prevent water seepage and making it ideal for heavy snow, wind, and freezing temperatures. Designed with a forest green top and black underside, this swimming pool cover blocks sunlight to discourage algae formation and helps keep water clean throughout the off-season. Its solid material acts as a barrier against leaves, dirt, and other debris, unlike mesh covers that allow water to pass through. Included with each round pool cover is a vinyl-coated cable and metal winch, which thread through metal grommets spaced every 2 feet for fast, balanced, and secure fastening. The grommets are rust-resistant, providing added durability over multiple seasons. Backed by a 12-year limited warranty, the Blue Wave pool cover above ground is a reliable choice for winterizing any backyard pool setup. This winter cover for above ground pool is easy to install, with all hardware included. It is available in the following size variations: 12-ft, 15-ft, 18-ft, 21-ft, 24-ft, 28-ft, and 30-ft models.