This lightweight and compact throne has a 12” round 3” thick cushioned vinyl top that uses top-grade foam for maximum comfort. The base is a single-braced tripod with an all-cast height adjustment collar outfitted with nylon bushing. The height-adjust support stem is textured and allows you to fine-tune your height. The support stem has a memory lock with a wing nut tension adjustment. Throne height adjusts from the lowest setting of 15 inches to the highest 21 inches seating height.