Under Armour Men's Black Tactical HeatGear Compression Short Sleeve T Shirt Size:2X Large Invisible zipper inside chest for Invisible zipper inside chest for embroidery access The idea behind the Port Authority Men's Safety Yellow Black Reflective ANSI 107 Class 3 Safety Heavyweight Parka is the same as many jackets: you need to find a way to separate your skin from the weather moves with the body and does not bind or restrict movement thanks to its stretch enhanced construction Sweat wicking technology pulls away moisture leaving the upper half dry and cool while the odour fighting property inhibits the growth of odour causing microbes and keeps sweat at bay