20'x40' Green Mesh - CES Rectangle Inground Safety Pool Cover - 15 Year Warranty - 20 ft x 40 ft in Ground Winter Cover with 4'x8' Center End Steps High-quality mesh pool safety cover Porous, tight mesh keeps out silt and debris Resistant to rot, mildew, UV, and damage caused by pool water White thread triple-stitched at all perimeter stress points Protected by rub strips