Airing out a new mattress topper is not necessary for your health and well-being. All of our mattress toppers are made exclusively in the U.S.A. Our memory foam mattress toppers are CertiPUR-US certified, while our latex mattress toppers are rated as Oeko-Tex class 1 safe. While there may be a “new mattress” smell after unpacking, it should dissipate in about 24 hours.