The EXO System jersey is Giordana's attempt at the ultimate cycling jersey a balanced blend of comfort, support, and aerodynamics. In pursuit of this goal, Giordana designed the EXO with five different fabrics, strategically located to provide that balance. The front panel is made with Giordana exclusive A. I. One. This is a two filament fabric that creates air pockets between the skin and the material to provide a cooling sensation. A. I. One also provides omni directional stretch for a perfect fit that won't bunch up. The fabric used at the sleeves and shoulders is Asteria 2. 0, which has the highest threads per square centimeter ratio in the cycling industry. Not only is the fabric incredibly soft to the touch, it provides support not quite compression, but similar to your upper arms, which absorbs most of the road vibration. At the rear, Giordana uses Host Carbon the same fabric used in its FormaRed Carbon pieces. This is an extremely breathable honeycomb knit fabric that also provides omni directional stretch for a perfect fit and near perfect aerodynamics.