The Fast Wing Tee takes technical features to the next level, with large mesh panels and 1/2 zip for ventilation, silicone print on the shoulders to keep a pack in place, and back pockets for gels or small items. Concept/Technology: AdvancedSkin ActiveDry. Fabrics: Light Jersey Knit / 4-Way Stretch Plain Weave / Mechanical Stretch Mesh. Fit: Active fit. Air vent system. 1/2 Zip with stay down puller. 2 gel pockets. Composition: Body: Pes 100% Insert: Pes 100%.