This Standard Offshore Helm Chair is ideal for fresh and saltwater use and will provide years of exceptional service. This seat is a one solid piece of roto-molded marine plastic for extra rigidity. Recommend using a 5"x12" mounting pattern pedestal. Features: Heavy-Duty 32oz marine grade vinyl with SunStop threading Snap in cushions for easy cleaning 6 year **Safe for all boating environments Measurements 23" total height 21" total width 22" total depth 14" seat depth 2 1/2" bottom cushion height