Castelli M Transition Air Jacket

The Men's Transition Air Jacket handles the shoulder of the season, when a ride starts cold and finishes warm and neither a jersey nor a winter jacket is the right call. Wind protection covers the chest and arms where airflow hits hardest, and more breathable fabric handles the back so a sustained climb does not turn into a steam bath. It is cut for a rider on the drops rather than one standing at a cafe, so the back runs longer than the front and the sleeves reach. Low bulk means it stows in a jersey pocket once the temperature turns. Men's sizing.