Keep your round patio set clean and dry! These covers are made of woven polyester fabric from dyed thread, instead of the more commonly used coated thread, to keep your cover fade resistant. Now treated with an environmentally friendly non-PVC coating on the underside of the cover to keep the fabric weatherproof and water-resistant. Seam construction has also been improved with higher quality thread and tighter stitching density; upper seams are double sewn with waterproof tape. Treated with BOSTECH™ surface treatment; a unique formula that repels water on the cover surface and also includes a UV inhibitor for long-lasting durability. Has solid brass eyelets and durable tie and cord locks for fastening and keeping the cover secure in windy conditions. Resistant to mold, mildew, and rot. Won’t crack in the winter and resistant to high temperatures in the summer. Bosmere has been making quality outdoor furniture covers since 1979.