Above-ground swimming pool cover will prevent debris, leaves, and trash from getting into and contaminating the pool water Constructed of durable PVC materials to last you multiple summers and extend the swimming season by maintaining the warm water temperature Recommended to use with 12-foot Round Steel Pro and Power Steel pools or similarly-shaped, 12-foot round frame pools; Pool is not included Features built-in drain holes to prevent still or excess water from accumulating on the top of the cover Includes ropes to ensure a secure, snug fit around the pool to help keep the water clean and at comfortable temperatures