Here's what other sites are saying:
When the chilly winds try to slow down your trail domination, zip up the ultralight Norrona Bitihorn Aero60 Jacket and make up for lost time. On a hike or a run, this windproof jacket takes the bite out of the wind, without adding many ounces to your pack. If the wind really picks up, shelter your ears and face inside the Aero 60's adjustable hood. And when things clear out, stash the jacket into its chest stow pocket and throw it in your pack.