Headrests serve not only for seating comfort but are a crucial safety feature. On the one hand, they absorb the backwards centrifugal movement of the head in a frontal accident; on the other hand they prevent the "whiplash effect" in a rear impact.
They thus counteract the danger of neck injuries. Maximum protection is only ensured if the head restraints are properly adjusted. That means, the upper edge needs to be adjusted approximately level with the top of the head.
Height-adjustable head restraints thus offer optimum occupant protection and are standard on all SEAT models.