Abstract: The invention is a sidewall for a cargo vessel having a seamless, snag-free interior liner. The wall includes an exterior skin that is rivetted to a first side of a supporting sidepost, and a seamless, snag-free interior liner that is mounted to the second side of the sidepost. The method for making the sidewall includes rivetting the exterior skin to the first side of the supports, and then gluing the seamless interior liner material to the second side of the supports with or without tension, and so that the interior liner is not at all pierced by fasteners, or only pierced in areas that are not likely to contact cargo. In a preferred embodiment, the interior liner is mounted to the second side of the supports under tension to maximize the interior liners' ability to absorb and deflect cargo impact and remain snag-free, sag-free and puncture resistant.