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- IP1-B dial closure system and Velcro strap
Power calculation system: IAV (Instantaneous Angular Velocity-based)
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The ribbed silicone sleeves induce turbulence to reduce drag on the most exposed parts of the body and thus promote speed
fly jack sey homme castelli Roues - IP1-B dial closure systemFor those days when you're not sure whether you need a jacket or just a jersey with arm warmers. Perfect for mid season, our Fly Jack sey still has built in protection (just in case). With our all new Castelli FFT (FLY Fabric Technologies) design. And a water repellent finish to keep you dry. All in an ultra light Jack sey. Product Features Ultra lightweight design provides warmth and protection Low neckline for better temperature regulation FFT
