Speed top for full-distance racing, or even to use just for the bike leg for improved aero performance.Includes a fastener to attach to shorts.FEATURES:-FEATURES:-Freedom of movement in the water, aerodynamics on the bike, comfort on the run.-Velocity Rev2 aero fabric on front-facing surfaces.-UPF 16 Velocity mesh back blocks 94% of UV light with generous breathability.-2 rear pockets lie flat and prevent nutrition from bouncing around.-GIRO³ flat gripper elastic lies flat on lower back.-SnapLock fastener at lower back to clip to your Castelli triathlon short to prevent riding up during swim or bike leg.-YKK® Camlock® zipper.-Elbow-length sleeves for maximum aerodynamics.