Was bit sceptical about ordering a good quality mattress that is rolled expecting it to be very poor quality but I was completely wrong. The mattress came rolled and boxed. I unrolled it and it immediately expanded to 12cm. I left the mattress for 3 days (longer than the 48hour recommended). After this time it had settled the springs and memory foam and measuring 22cm. Was very surprised and very pleased with my purchase. It is a firm comfortable mattress that is of the best quality. Very highly recommend.