Specialized Bike Seats

specialized
Highly skilled in a specific field
Concentrating on a small area of a subject
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Requiring or involving detailed and specific knowledge or training
Designed for a particular purpose
developed or designed for a special activity or function; "a specialized tool"

seats
A sitting place for a passenger in a vehicle or for a member of an audience
(seat) show to a seat; assign a seat for; "The host seated me next to Mrs. Smith"
A thing made or used for sitting on, such as a chair or stool
(seat) a space reserved for sitting (as in a theater or on a train or airplane); "he booked their seats in advance"; "he sat in someone else's place"
The roughly horizontal part of a chair, on which one's weight rests directly
seating: an area that includes places where several people can sit; "there is seating for 40 students in this classroom"

bike
A bicycle or motorcycle
bicycle: ride a bicycle
bicycle: a wheeled vehicle that has two wheels and is moved by foot pedals
motorcycle: a motor vehicle with two wheels and a strong frame