Magma Party Size Kettle Grill CoversMagma Party Size Kettle Grill Covers are constructed of Sunbrella solution-dyed acrylic fabric, the same fabric used for boat covers. This fabric is water and fade resistant, breathable, and designed to resist damage from UV rays and mildew.5 year warranty covers the fabric becoming unserviceable because of loss of color or strength from normal exposure conditions including sunlight, mildew, rot, and atmospheric chemicals.1 year warranty on all other compounds.