Abstract: A seat cover for an outdoor chair. The seat cover includes a seat panel, back panel, and right and left side panels hingedly attached to each other. Each of the panels includes an outer washable fabric cover and an inner flexible foam core. The back panel has a strap that fits over the back of a chair. The side panels have straps with releasable fastener elements, the straps being adapted to be pulled around an adjacent structural member of the chair to the backside of the chair and releasably attach to a mating releasable fastener element located on the back side of the back panel. Each of the side panels have straps with releasable fastener elements adapted to stretch around the adjacent arm of the chair and releasably attach to a mating releasable fastener element located on the side panel.