Bullet proof design. Heavy duty construction. Maximum durability without sacrificing comfort. Double contoured seat pan. Design eliminates pressure points. Marine grade stainless steel hinge pins secure the fold down back. 1/4" x 20 T-nuts included. Easily mounted to any standard boat seat swivel, slide or spider. All Weather Boat Seat shell is compatible with Tempress Quci Disconnect mounting kits. Custom fitted cushion included. Wrap around seat design. 30 oz. marine grade UV stabilized vinyl. High density seat foam inserts. 18½" x 18 1/4" W x 17" D.