I ordered this to protect my new memory foam mattress. I haven't tested whether it's really waterproof. In terms of comfort, everything is fine. It feels a bit plastic and makes a little noise, but both are negligible. Sometimes the bed gets hotter. Waterproofing and breathability just don't mix. The mattress topper is clearly somewhat breathable, but that's not enough for those who sleep in a hot state and shed sweat. I see this product as pure protection that needs some sort of absorbent material over it, like a traditional mattress topper with some padding. Alternatively I would consider a similar protector with terrycloth over it if I were to buy again and didn't want to buy two pieces. I wish I could find a cotton comforter like the ones used in cribs. in summary. Good as a defender, but not so good at breathing.
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