The active run tee is a combination of our 2 performance fabrics to ensure it will perform in all environments. The main body of the garment is from our new high filament Maximum Moisture Management (M3) fabric which rapidly moves moisture from the body to the surface for evaporation – keeping you cooler and drier for longer. On the back, shoulders and under the arms we have our 302 sports mesh (SM302) which is designed to cool your body by allowing heat to dissipate quickly. The balance of the M3 and SM302 fabrics ensures maximum comfort and performance. The faster you run the harder it works.