This is a gel bicycle seat cover. The center has a recess for anatomic comfort. Supportive gel padding with soft lycra cover. ATB/Racing Gel Seat Cover, Designed To Fit Most Bike Seats, Gel Filled Pad Fits Over Existing Seats. Secured With Drawstring For Long Lasting Comfort Two Sizes: Medium and Large Get More info on this web page: http://www.aerotechdesigns.com/seatcovers.htm#gelseatcover Availability: Usually ships the next business day. Sportourer Easy Gel Seat Cover (by Selle Italia) GELCoverLG$25.95Size: MediumLarge Thank you for your interest in our cyclewear! We ship all orders ASAP email: cyclewear@aerotechdesigns.com Website: http://www.aerotechdesigns.com