The hybrid construction of the alpha vest combines x-lite 19 fabric that is ultralight and blocks headwinds with 60;g of polartec alpha insulation. The heavyweight polartec drytex 6000 on the back insulates and stretches for freedom of movement. The full-length front zipper is offset for enhanced comfort when layering with another zippered jersey and/or jacket. The vest is packable in the zippered back stow pocket and has a chest pocket as well. The vest has a close-to-body fit but its stretch ability allows for multi-layering.