The Rapha Pro Team Infinium Long-Sleeve Jersey builds a GORE-TEX Infinium Windstopper body that blocks wind and resists water without trapping heat, then adds high-stretch nylon panels under the arms and along the hem where the body needs to vent and move most. Elasticated cuffs seal out drafts at the wrist, and 360-degree reflective heat transfers keep a rider visible from every angle in low light. What Our Gearhead(R) Experts Are Saying:"I stay warm on an exposed headwind stretch and never overheat once the pace ramps up on the climb after, since the panels under my arms vent exactly when I need them to. The front never lets a single gust through even at speed on the descent."