I don’t know how bug proof these would actually be, because you can pretty much see between the teeth of the zipper... there is a flap of fabric behind the zipper on the the interior but it has no velcro or anything to seal the zipper away from the mattress... so I’m not sure what the purpose of the flap is. Also the zipper goes fully around one end and one side so that is a lot of space for bugs or mites or whatever to get through. Other than that it is sewn ok with no tears, and is very breathable, not like the “waterproof” covers that seem to be all I could find elsewhere. It doesn’t make any noise and isn’t too loose on my approx 7 inch mattress. But again, I’m concerned about the bug proofness. It was cheap though so not a huge loss.