These mattresses are amazing. I’ve never bought a foam mattress before and purchased them for a guest bedroom. They come rolled up in a box and are very heavy. Some reviews say they took a while to expand but that was not the case for me. Within an hr they were at full size. There is no odor at all. They are a perfect fit on the frames I purchased and soooo comfortable. I slept on it last night and I slept like a baby. Do not make you feel warm. They’re perfect.