Constructed of our strongest and most tear resistant material. This pool cover features rugged U.V. stabilized woven polyethylene that protects it from sun, snow, wind and ice. It features a black underside to retard algae growth and heat sealed seams to ensure a crystal clear pool next spring. Complete with heavy duty vinyl coated cable and winch tightener! 18' x 38' Oval - Cover Size (4ft Larger Each Dimension)