Movin' Sit (Junior)The Movin Sit Junior is a wedge shaped air cushion, which helps to achieve an upright sitting position and strengthen core postural support muscles. The wedge shape encourages a seated posture with a forward pelvic position and good upper trunk posture and back alignment. The surface is tectured with small bumps. Great for sitting at desks or computers. The Movin Sit Junior fits on most primary school chairs. Measures 26cm x 26cm.