Polisport Joy FF (Seat Tube Mount)The Joy bicycle seat has an ergonomic design for greater comfort for the child and is compatible with the use of a helmet. Its openings in the backrest contribute to better ventilation and reduce air friction, ideal when used without the child. It also has an integrated foot protection, adjustable footrests, increased side protection area and a reflective rear sticker. 3 Point Safety Harness Adapts to Round and Oval Tubes between 28 to 40mm Adjustable