Nike Running Aeroloft Flash Sleeveless Goose Down Vest Reflective Womens Medium The Aeroloft Flash Vest combines Nike’s signature winter technologies: Aeroloft and Flash. Aeroloft is a lightweight loft – 800-fill goose down – designed to keep your core warm & repel water. Flash uses reflective technology to keep you visible on the city streets. Red, orange, silver, black. 18” armpit to armpit and 24.5” long lying flat.