Research in the wind tunnel has proven the Speed Tech fabric to be the fatest out of over 180 fabrics tested. It is now featured on the Aero Jersey's shoulders and back for minimum air drag on wind-sensitive areas. Many areas of the Aero Jersey are optimized for cycling position such as the pre-shaped shoulders, the short front zipper and the 2 floating back pockets that are almost stuck to the jersey to minimize air drag. Ventilated side panels ensure efficient heat management even on the hottest days.