Aly Lopez was a writer on the sleep and wellness team at CNET. She tested, researched and reviewed sleep and health-related products, technology and trends. She received her bachelor's degree in ...

Memory foam is loved for its sink-in properties that mold to your body as you sleep. Made from, mainly, polyurethane, often referred to as 'viscoelastic', it's soft, dense, and comfortable to lay on.

Just because your mattress isn’t cutting it as a bed doesn’t mean it’s useless. That memory foam has life left in it. Every mattress has a useful lifespan, and if you’ve ever kept an old mattress ...