GLI Secur-A-Pool 16 FT X 38 FT Rectangular Mesh Safety Cover System, Green GLI Secur-A-Pool Actual Cover Size 18-Feet by 40-Feet Rectangular Mesh Safety Cover System, Green 50-Percent more puncture resistant; improved resistance to damage and puncturing from falling tree branches, deer hooves and stray animals PVC coated polyester fabric is 30-Percent lighter than standard solid covers 100-Percent sunlight blockage; no springtime algae growth Comes with pump in lieu of drain