Sea Eagle Inflatable SEC Kayak Seat Inflated measurements: 17" wide x 21" deep x 16" tall Inflated seat base measurements: 17" wide x 12" deep x 1" high Inflated backrest measurements: 17" wide x 13" high x 3" thick Deflated Measurements: 15" x 12" x 1/2" Good Back Support from its large rear air chamber. Weighs 1.7 lbs.