The Janji Zephyrunner Wind Shell is a lightweight running jacket for breezy, changeable conditions. Its nylon shell carries a PFC-free C0 durable water-repellent finish and a 16 CFM airflow rating, balancing wind resistance with ventilation during higher-output efforts. A vented back panel helps release heat while maintaining coverage across the front and shoulders.
The jacket packs into its own chest pocket, with an integrated format suited to carrying in a running vest or travel bag. It also has two zipped hand pockets, a zipped chest pocket, an adjustable bungee hem, a hood toggle and reflective logos. Janji lists the men's medium at 124 g, though weight varies by size and cut.
This is a wind shell with light water resistance, not a waterproof rain jacket for prolonged heavy weather. Layering needs will depend on temperature and effort. Men's and women's cuts, colours and sizes are grouped under one model entry. The US$156 reference price is Janji's current regular US price, checked on 23 October 2026. This description is based on manufacturer specifications rather than first-hand testing.
