Runner safety is the purpose of the high visibility NightLife collection. The fourth round of the Infiniti Jacket is a softshell outer layer which announces your presence the moment light hits it.
The cut is tapered and close fitting but with a stretch to the fabric that improves the comfort and performance. Zippered side pockets and a drawchord waist add stowage as well as a customizable fit. A waterproof coating makes it versatile, and it is recommended for 40-65 degrees, while adding a base-layer could handle a bit cooler conditions. Visible from quite a distance, only myopic or inattentive drivers could overlook you, and those are the folks you really hope to avoid. The light weight of the Infiniti won't hinder you, and that's a one-two combination to keep you running.