Twixt Extended-Height Saddle Seat Stool, Backless, Supports Up to 300 lb, 22.9" to 32.7" Seat Height, Black Seat. Saddle seat allows for sitting or perching to help keep hips engaged, encourage better posture and may allow better breathing from the diaphragm. Flexible ring under base allows user to adjust angle of sit for increased comfort during use. Allows user to lean or perch to help them vary their postures and add more movement into their day. The seat tilts independently of the base, creating another axis of movement. Height-adjustable from 22" to 31.75"H to fit a variety of users and work surfaces. Vinyl seat is easy-to-clean with a 360-degree swivel. As part of the Active Collection, this stool is designed to promote active movement throughout the day and engage major muscle groups to help combat the negative effects of inactivity in many workplace settings.