With our bullet proof design and heavy duty construction, our Tempress All Weather High back boat seats might outlast your boat. Tempress High Back All Weather seats are made with corrosion-proof polypropylene seat shells, connected with heavy duty stainless steel rivets. The All Weather features a double contoured seat pan to eliminate pressure points and high density, custom fitted foam padding for all-day comfort. Stylish 30 oz. , heavy duty, marine grade UV stable vinyl upholstery increases appeal and durability. Includes (4) 1/4" - 20 x 1" bolts. Allows mounting to any 5" x 5" standard marine swivel (swivel not included), slide or seat spider.