They were bought for insect repellency so I don't know or worry about waterproofing. All I know is that they did their job, they were easy to put on mattresses, box springs and pillows. I was concerned that they would warm me up too much as many people assumed, but that wasn't a problem at all. I tend to be very warm and am always looking for a "cool" spot in bed, but these bedspreads didn't increase that need at all. Good taped seams and zips. It's been about a month since they've been on our bed and we're very, very happy. Sorry I don't know how well they waterproof the mattress.
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