100% solution dyed polyester fabric. Resists mold, mildew and fading. UV colorfast up to 1,500 hours. Water-resistant fabric and a minimal number of seams guard against moisture entry. Engineered to withstand tears and abrasion.Sewn from 600-denier, solution dyed polyester fabric, these covers guard against searing sun, blinding rain and bitter cold. Engineered to resist tears and abrasions, the covers also shrug off mold, mildew, water and wind, with heavy-duty buckles that hold covers securely in place. The covers are cut and sewn to graze the ground, delivering ample coverage from top to bottom