100% Treated Cotton to prevent fading, wrinkling, and shrinking. Tough melamine buttons. No Roll Collar with flexible collar stays. Reinforced dual pen pockets on left sleeve. Long Sleeve. The 5.11 Professional Polo Shirts has two pen pockets located on the left sleeve.  This unique feature allows an operator to safely store a pen and pencil or a small pen light along the arm rather than in the button down portion of the shirt, eliminating the danger of being injured during rigorous activity. The no roll collar has flexible stays which keep the collars from rolling at the edges.  The pen pockets are stitched to endure constant use and all seams are designed for both comfort and durability.