XLC Big Butt Bike Saddle seat spring loaded 13x13" XLC trike Extra wide seat Large, comfortable bicycle or exerciser bike saddle Fits Bikes, Exercisers, & Schwinn Airdynes with 7/8" Seat Post Nose Heavy Duty Steel Base with Springs Rugged vinyl cover , 400 IBS rider is OK . Lots of padding for extra comfort "Anatomical dip" down the middle, to help relieve pressure for both men or women. Measures approximately 12-3/4" x 12-3/4" Seat clamp included. Fits seat posts with 7/8" nose same day shipping order by 3PM ! Only shipping to 48 states !