Tempress Fisherman's Armless Seat 30 oz. Marine grade vinyl Comfortable seating surface Built in lumbar support and a rolled front edge Designed to withstand the marine environments Provides comfort, durability, and superior style Captains Comfort seat Comfort Style panels with lumbar support Stainless inserts allow for easy mounting to hardware If mounting to a standard swivel with 4 holes this seat requires a reinforcing plate;It can be purchased separately under part 57005 Made in the USA