The cover has a mesh strip in the front and back. I'm not sure what they are for but if your grill sits out in the open, the mesh allows water, dust and whatever to get inside the cover. One of the reasons I bought the Genesis Gold B was because of the enclosed area under the grill. The first rain came right thru the mesh and everything inside the enclosed area was soaked. The same thing with dust. I'm trying duct tape over the mesh areas. If this will not work, it will be new cover time! Very dissapointed with the cover but the grill is great!