Crescent Piston is a contemporary stool with a comfortable upholstered seat and backrest on an adjustable gas piston base which swivels and also adjusts easily from a counter height to a bar height with a lever that activates the gas piston mechanism. The solid steel round base is available in chrome or stainless steel. The seat has a steel structure with “S” shape springs for extra flexibility and strength. This steel frame molded by injecting polyurethane foam. Crescent seat is upholstered with a removable zipper enclosed leather, PPM, leatherette or wool fabric slip cover. The stool is suitable for both residential and commercial use.