These covers are made from a ventilated, heavy-duty material. The weatherproof fabric protects against fading from UV rays.  Covers are available to fit all Big Green Egg Nests; the Nest covers fit all configurations of the EGGs in Nests with or without Shelves or Handler. Specifications: Fits Nests with Handlers, with or without shelves Fits Large EGG 100% Weatherproof Protected against fading from UV rays Mildew resistant Increased durability in extreme temperatures Allow the EGG to cool before covering ONLY for Large EGG in Metal Nest with Handler or Royal Mahogany Base For more information about this product, including sizing, please visit the Big Green Egg website or contact The Fireplace Company now.