I was so disappointed when i recieved the mattress. The box was big, opened on one end, and without any paper or instruction. Fortunately, the mattress itself was covered by a clear plastic, and i read it on line that i need to let it air out for at least 24h. You should put it on your bed, 'cause it difficult to move it around after it expanded. It was OK, for a no name brand & for the price. It does not get flatten very much as one reviewer had mentioned. I weight 110 lbs and had the mattress for 1 month.