The ergonomic design of the NaviStyle folding seat includes lower back support to promote correct posture and reduce fatigue. Built for lasting comfort with UV-stabilized polypropylene frame, stain-resistant marine-grade 29-oz. vinyl, high-density foam, no-pinch hinges, and stainless-steel hardware. A built-in locking tab at the rear of the shell locks the seat in the down position. Compress the seat to unlock the tab and lift the seat to upright position. Fits standard swivels, pedestals, and slides. 18.75"H x 18"W x 19.5"D.