Abstract: A seat for use with a shower or commode chair includes a seat region including a contoured upper surface for supporting a user's buttocks and thighs, the upper surface including dual laterally spaced recesses in the upper surface to accommodate the user's thighs; and a lumbar support region behind the seat region for supporting the user's lower back. The seat region and the lumbar support region are integrally molded together into a unitary seat. The unitary seat is formed by injection or blow molding formed, for example, of foam having defined temporary deflection and indefinite shape retention characteristics. At least a front surface of the lumbar support region and at least the upper surface of the seat region are substantially covered with a substantially impervious material that is non-reactive with the user's skin.