Fast wicking technical lightweight base layer for use year round. Race 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 & in turn keeps you drier For ultimate comfort circular knit construction means you dont have any seams running the length of your body Soft binding on neck & arm opening Main fabric; 70% Polyester / 20% Polyamide / 5% Elastane Limited lifetime warranty