Keep your patio furniture clean and dry. This Deluxe adirondack chair cover is made of woven polyester fabric from dyed thread instead of the more commonality used coated thread to keep your cover fade resistant. This cover is treated with an environmentally friendly non-PVC coating on the underside to keep the fabric 100-percent waterproof and the seam construction has also been improved with higher quality thread and tighter stitching density; upper seams are double sewn with waterproof tape. It is also treated with the Bostech surface treatment; a unique formula that repels water on the cover surface and also includes an UV inhibitor for long lasting durability and it has solid brass eyelets and durable tie and cord locks for fastening to keep the cover secure in windy conditions. Resistant to mold mildew and rot plus it will not crack in the winter and is resistant to high temperatures in the summer