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The Castelli Aero Race 5.0 Jersey FZ is the fastest, most aero jersey Castelli has ever produced. But it's not just aero; it's also extremely light, weighing in at just 98 grams. Special Velocity Dry fabric on the front and shoulder panels provides a smooth, clean fit to reduce boundary layer drag and delivers excellent wicking and faster drying. The wide and flat mesh sleeve cuffs maintain a flat, aero profile while the compression band around the waist keeps the three rear pockets in place when fully loaded. Velocity 3D fabric on back and sleeves provide unrivaled breathability and wicking capabilities to keep you cool and dry on the hottest days. Full length zipper with reflective tabs on rear.