The Trail Breaker Half Zipper Jacket is a lightweight midlayer built for runners who keep moving no matter the conditions. Designed with packable performance in mind, it delivers breathable comfort while staying easy to stash when the trail heats up. Four way stretch mesh panels promote airflow and unrestricted movement during dynamic runs. Thoughtful details like thumb holes and a built-in watch window support cold weather training without slowing your pace. Finished with light weather protection and a streamlined fit, this jacket is made to adapt to changing conditions and fast-moving adventures. | On Men's Trail Breaker Half Zipper Jacket