In The Swim 12 x 24 ft. Oval Micro Mesh Pool Winter Cover Micro mesh pool cover traps the finest silt and debris preventing them from contaminating your pool Hems are stitched with heavy-duty U.V. treated polypropylene thread to resist rot Has a black underside to inhibit algae growth All pool covers come complete with heavy-duty vinyl coated cable and winch Has reflective silver coating on the top to speed up the snow's melting process