Attractively patterned mid-back CentricT SAST (Shock Absorbing System) spring suspension seat is trimmed out with backrest upholstered insert (for deep tuck styling) and molded polyurethane foam with stapled-in-place marine-grade vinyl upholstery. Seat includes corrosion resistant t-nuts for attachment to seat pedestals Centric Contour supports spine in proper curve spring movement reshapes seat to promote circulation. 20.5" front to back.