In other words, products inflated initially to a steady state pressure of between 20.0 to 22.0 psi should retain pressure in the range of about 16.0 to 18.0 psi for at least about two years. [0042] The bladder may be inflated with air or components of air such as nitrogen, or with supergases, preferably with nitrogen, to an internal pressure of at least about 3 psi, preferably at least about 5 psi