Available in a choice of sizes, our mattress topper features a soft, long-lasting polycotton cover, a memory foam filling, and has a durable, machine washable cover. The firmness rating of the memory foam will be dependent on your mattress type. Feeler samples are available in-store. A slight odour can be expected that will disperse in use. Once unpacked air for 24 hours and to allow foam to recover from packing.