Hollow-fibre: Designed to support your back and spine with its springy bounce-back hollow-fibre filling, aiming to support your posture and minimise aches. Comfortable: The perfect size for sitting comfortably in an armchair or office chair! Product dimensions: 67cm x 55cm x 19cm. Back support cushion: Get a lumbar support faux velvet cushion in grey. Material: Made with soft, faux velvet fabric.