Jobri Saddle Chair. The Saddle chair is designed to provide the “ideal” sitting position with the knees lower than the back in a natural position aligning the back shoulders and neck. The seat can be adjusted for height and to change the amount of force required to change the forward tilt allowing the user to carry out lower back exercises. Polished Aluminum frame with nylon casters Gas height adjustment Tilt adjustment Supportive Polyurethane foam Black vinyl Height range: 21″ to 28″ Seat measurement: 14″ x 17″ Assembly Required. Materials: Polyurethane foam and metal. Dimensions: 25″L x 25″W x 28″H Weight: 17.5lbs.