My 365 cover is still airing out after a good rainstorm here in Denver. These products, despite claims to the contrary are NOT waterproof. I realized this after I went to do a spot check of my 9.25 on a CGE mount that I had covered with both a tripod cover and a 365 cover on the scope itself. After having to do a mid-rainstorm rescue of my 9.25 I can honestly say that these are NOT waterproof, and should not be used for more than dust covers.