Like all newly manufactured items, your new mattress may have a slight smell right after you unwrap it. However, the smell should go away pretty quickly (anywhere from a few hours to a few days). Don't worry! The smell is not associated with any harmful chemicals or off-gassing since all of our foams are CertiPUR-US® certified. For the first few days, or until the smell goes away, let your mattress breathe as much as possible.