Abstract: An improved seat, including a support member having a plurality of legs extending rigidly outwardly therefrom. An upright tubular inner column is affixed to said support member and is telescopically engaged by an upright tubular outer column whose top carries a device for supporting a person. A vertically pivotable footrest is carried by the ends of a pivot shaft which is, in turn, carried by the outer column. In one embodiment a locking pin, carried by the footrest, is selectively engageable with any one of a plurality of vertically arranged locking holes located in the inner column. In another embodiment, the locking pin, carried by the pivot, is located within the inner column, and selectively engages one pair of a plurality of pairs of vertically arranged locking slots in the inner column. In both embodiments, the height of the seat is adjusted by pivotably lifting the footrest to selectively engage and disengage the locking pin and its associated locking hole or locking slots.