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The Men's Transition Air Vest is built for what the name says: the part of a ride where conditions change and a full jacket is too much commitment. It layers over a jersey to cut wind across the chest while leaving the back open enough to vent on a climb. Weight and packed size are the whole point, so it stows small enough that carrying it costs nothing on a ride where it may never leave the pocket. Castelli cuts these close to the body, so a flapping vest never becomes the problem it is on a looser garment. Men's sizing.