This is no ordinary t-shirt. Its bursting with technology tohelp you stay comfortable. When youre working hard, its specialARGENTIUM® fabric technology has great wicking properties,keeping you cool, dry and fresh. On sunny days wear it on itsown and the rays meet a barrier of UPF 30 protection thatsbuilt in to the main fabric. Plus, the fabric is fast drying sowill have you back to feeling comfortable in no time when youreworking hard.