Using this 3 - inch twin memory foam mattress topper is a breeze. First, when you receive it, unpack the compressed topper and give it 48 to 72 hours to fully expand. Once it's expanded, simply place it on top of your existing mattress. The memory foam will conform to your body shape, providing great pressure point relief. For a good night's sleep, enjoy the natural calming and relaxing benefits from the lavender infusion. When it comes to maintenance, if there are any small stains, just use water and a dry cloth to spot - clean it. Make sure not to use harsh chemicals or soak the topper in water. And since it doesn't require assembly, you can start using it right away after expansion.