Wise 8WD562-3-710 Offshore Ladderback Helm Chair w Mounting Plate This Wise Offshore Ladder Back Helm Chair is designed to provide comfortable seating season after season. Roto-molded, high impact marine grade plastic external frame and arm rests provide support while standing up to harsh marine environments. Snap-on cushions are covered in heavy-duty 28 oz marine grade vinyl that has been UV treated and is mildew resistant. Cushions feature compression foam padding that delivers all-day comfort