2” thick urethane foam. Upholstered in seamless heavy duty, tear-resistant nylon-reinforced vinyl. Formica high pressure laminate finish on all exterior surfaces. 18” height is convenient for therapist and wheelchair accessible for patient. All models have (6) legs for increased strength and stability (except 1412-46). 1000 lb. Weight Capacity; The maximum patient weight that this product can lift or weight amount it can accommodate. Wheelchair accessible. 3 Year Warranty.