Ariat Rebar Made Tough Venttek Durastretch Work ShirtRebarTM Made Tough Shirts are designed to keep you comfortable while working hard. With Moisture Movement TechnologyTM to keep you dry, VentTEKTM mesh panels to keep you cool, and DuraStretch materials for maximum range of motion. Greater Arm Mobility seam construction for maximum range of motion Moisture Movement Technology wicks moisture away from the skin VentTEK technology features body mapping to enable air flow and regulate body temperature