Came back to edit my review after a quick response from the seller. The bottom layer is made of TPU and polyester and it's really waterproof! I'm adding two stars because the mattress topper is soft and comfortable and has a waterproof layer that's hard to come by. Original Review: The seller keeps answering questions and lists in the description that this mattress topper has a waterproof TPU lining, but I can't figure out if that's true. The bottom layer is obviously polyester but I think it feels like a lining underneath. However, the tag does not list polyurethane. I just hope it's really waterproof, or at least thick enough to withstand my two kids' knocks.
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