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The men's SmartWool Merino Sport Ultra Light Jacket is your ultimate lightweight running and travel companion.

SmartWool created the Sport Ultra Light Jacket to pack down small, so you can stash it almost anywhere when you’re on the go. But you can deploy it when the weather turns for protection against the elements.

Designers used panels of Merino Sport 150 mesh to enhance breathability and temperature regulation, and they gave it a DWR coating to shed precipitation. Reflective elements boost visibility in low-light situations, and the ultra-light outer shell fabric keeps the jacket to a feathery 4.73 oz.

With the ability to pack completely into its own chest pocket, there’s no reason to leave home without the men's SmartWool Merino Sport Ultra Light Jacket.