Meyco 20 x 40 ft. Rectangle Safety Pool Cover Crafted from super-strong, two-ply Meycolite mesh with a break strength of more than 4,000 lbs Resists rot, mildew, sunlight and chlorine damage Cover is held in place with Meyco's time-tested spring-loaded brass Pop-Up anchoring system Mesh allows rain to seep through, but screens out leaves and debris The cover is forest green