I did my research before i bought and wanted a 3 inch, 4 lb product. This came quickly, it fluffed up quickly (in a few hours) and i slept on it the first night. I am sensitive to chemical odors and honestly have not had any problems with this memory foam topper. You will need fitted sheets with a deeper pocket than normal to cover the memory foam and your mattress. I am very happy with this purchase and Overstock.com has done a good job for this customer.