The green memory foam I purchased is decent for putting over a sagging mattress with uneven springs. It does not retain the shape that the big name companies brag about. It does, however conform to your edges, elbows & knees. Great for injured ligaments or sore muscles. It can be moved and used in lieu of extra bedding for guests also. The price is a fraction of what you will pay for the big named products. It comes shipped to your door in a small(er) box. It takes about +/- a day for the product to unwind from it's box shape & for it's manufacture-scent to dissipate. I would recommend this product.