Dia which is windproof, rainproof, sunproof, dustproof, etc., which allows the sunshade to withstand extreme temperatures, frost, snow, rain, and UV rays. internal coating and double-sewing: The inside of this parasol umbrella cover is coated with PU coating, the water droplets ...Dia which is windproof, rainproof, sunproof, dustproof, etc., which allows the sunshade to withstand extreme temperatures, frost, snow, rain, and UV rays. internal coating and double-sewing: The inside of this parasol umbrella cover is coated with PU coating, the water droplets will not penetrate the umbrella even if it rolls down from the fabric, and the double-sewing design increases the firmness, which can be waterproof, dustproof, windproof.