Solution dyed polyester for rugged and harsh outdoor conditions. Keep your riding lawn mower out of extreme elements when stored in summer or winter (rain, dust, mud, wind, sun, snow and birds). 100% WATERPROOF - Thick inner polyurethane rubber coating and seam sealing keep your tractor dry even in heavy rain. Two ventilation holes prevent water condensation. For those who value quality - a premium line of products made from heavy duty materials. 210D marine-grade fabric, double stitching and UV protection ensure durability. The fabric remains flexible in winter without cracking. Easy to Use - The elastic hem ensures a snug fit around the garden tractor so the cover doesn't fly off on windy days. Includes storage bag.