If you want to save money on a memory foam mattress buy a bunch of these and stack them on top of each other. If you're stacking directly on a hard surface I suggest a minimum height of 7 toppers.if you weigh 200 to 250. They will need a little time to expand fully. But not a big issue. All of them work that way. I don't like the pre made memory foam mattresses that have all that junk in between the foam. Over time it pokes you. Just get straight foam and stack em. Also lighter and if need be you can always roll them back up. They probably won't fit in their original packaging after being used for a while but it is much easier to move around than a 30 lb mattress. They will stink for a while. That just the vocs in the foam. Ideally it's best to unroll and let them air out for a week or two. They will always have some sort of odor. It's just how memory foam is made.