We were very excited by this matress. My son found it comfortable and liked it. We purchased it before he went to camp, and after 6 weeks he started sleeping in it regularly. He started to wake up with headaches and nausea. Then he started throwing up in the middle of the night. We could not figure out what was happening. His mother researched that foam mattresses may claim to be hypoallergenic, but that may not be the case. My son slept in my bed for a few nights and, bingo, he was fine. We called Zinus and they said that we were past the 30 day return window and there was nothing we could do. The warranty doesn't cover a return. Frustrated beyond belief.