Our lightest running jacket ever, the Nike Impossibly Light Men's Running Jacket offers lightweight coverage with durable nylon fabric. Ultralight Comfort Ultra-lightweight nylon fabric weighs just 85 grams (approx.), helping to reduce distractions while providing lightweight, comfortable coverage on outdoor runs.  Weather Protection The DWR (durable, water-repellent) finish offers wind and water resistance to help protect against the elements. Packability This jacket is designed to pack into its left-hip pocket for convenient storage on the go. A hand strap allows for easy carrying while moving.