This is the same seat that comes with the NRS GigBob 2.0 and came with the original GigBob 1.0 version.
Seat comes with straps to anchor the seat in place. In the GigBob there are D-rings fore and aft for attachment.
This excellent seat can be adapted to other craft; you'll just need to be creative with attachment points.
Seat bottom is 18" wide, 16" front-to-back and soft foam bottom is 3/4" thick.
Sturdy seat back is 17" high, for good back support. Total width is 24": however, there are 7" panels on each side that can fold in to match the seat bottom width. 3/4" thickness.
On the back of the seat there's a removable zippered storage pouch, 10"W x 10"H x 4"D