Fast wicking technical lightweight base layer for use year roundRace fit, designed to hug the body,Open mesh fabric aids air flow to prevent over heating,The 3D back to the fabric reduces contact with the skin to aid airflow, and in turn keeps you drier,For ultimate comfort, circular knit construction means you don\'t have any seams running the length of your body,Soft binding on neck and arm opening,Main fabric; 70% Polyester / 20% Polyamide / 5% Elastane,Limited lifetime warranty.