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 rays, 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 Free Tri Short to prevent top from riding up during swim or bike leg YKK Camlock zipper 91 g (S)