The durable 600 thread count fabric is heat resistant up to over 400ºF. This allows use even when the barbecue had been just turned off. The heat resistant fabric will not ignite, melt or deform at this typical use temperature. The cover is designed to be breathable and yet water resistant, protecting the interior from mold as well as the elements. The unique CoverSeal heavy duty weighted bottom apron seals the cover to the ground preventing ingress of rodents, insects and other troublesome creatures. Lab tested to 40MPH, wind is unable to get under the cover making it difficult to blow off the barbecue. The material will also reflect a high percentage of the sun's rays reducing bleaching of the barbecues original color. It is lined with a black bottom surface so any residual burnt soot or other residue will be concealed, keeping the look of your cover clean.