Roto-molded, high density polyethylene seat backs and bases are designed for comfort, good looks and durabilityVirgin foam with a 1.5 density and no "fillers" for lasting comfortFilm barrier between foam and vinyl allows quick recoveryHeavy-duty 28 oz. marine-grade vinyl is mildew resistant and UV treated to withstand fading6 Year Warranty on Frame3 Year Warranty on UpholsteryPlease note that cushion sets and matching bases for benches and corners are now sold as separates.