Posture Pro Full Spine Model 4100-SCombining neck Model 1100 S and back Model 2000, the new Comfort Visor Posture Pro Full Spine Model 4100 S gently molds to the shape of the forehead (no chin or jaw contact). Does not hyper extend the neck. Single EED air cell* decompresses and hydrates cervical discs, while shaping & restoring the cervical (neck) curve at moderate pressure levels for comfortable, corrective deep relief. Simultaneously, two opposing air cells in the lower back unit