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The mattress I'm using now is hard, so the moment I lay down on the Coway One Body Zero mattress, I'm twice as impressed, twice as good at sleeping. In particular, you know that you can't just put the mattress on the floor, right?! Since it doesn't have ventilation, it absorbs moisture from the floor and causes mold, so you definitely need a mattress pad. However, Coway is an all-in-one, so you don't have to buy it separately. Thanks to that, I think I'll be able to sleep well.