Offering all-day comfort, these quality Centric? Hi-Back Seats with SAS? are reminiscent of the seating in an expensive sports car. Ergonomically contoured and designed to eliminate pressure points, these comfortable seats are built with side support bolsters to ensure riders remain securely seated in the seat while the S-curved backrest relaxes the spine. Sporting attractively patterned marine grade vinyl upholstery; these seats feature the patented SAS shock absorbing system. Completely integrated into the seat pan, the SAS system's quad-spring grid suspension reduces the shock that hull pounding transfers to a seated boater and is capable of absorbing up to 4Gs of impact. Perfect fit in confined location, the seats rotate on a 23'' diameter and are equipped with Centric's patented pinch-proof hinge and lock-down detent to secure the seat in a down position. Centric's heavy-duty blow-molded construction meets and exceeds ABYC H31 impact standards. Easy to install, each seat includes corrosion-resistant T-nuts for attaching to seat pedestals. Measures: 19''W x 21''D x 26''H.