Abstract: A seat cushion having a flexible substrate and pads. The flexible substrate has first and second pads in a spaced-apart relationship, forming a hinge of the substrate therebetween. The flexible substrate may be moved from an open lay-flat position to a closed position in which said pads are in a face-to-face relationship. The pads are formed of a comfort-compressible rubber composition and have a pattern of projections thereon in a spaced-apart relationship. The pattern includes a concentric array of projections extending substantially across the width of each of such pads. The rubber composition has a non-porous surface, and the flexible substrate and pads are washable. The seat cushion is particularly useful in saunas and steam baths.