*Alert: True to size : Please follow the size examples below*(EX: Size Large recommended - Size for 6 215 lbs.) (EX: Size Medium 5'9165 lbs.) CQR FrostTech Series designed for active movement. [Materials] 100% Polyester fabric is for moisture sensing, quick-dry, and 2-way air circulation. [Classic Design] Either classic 3-button or crewneck design fit appropriately anywhere. [Pen Pockets] On the left sleeve for quick accessibility. It is suitable for tactical training, hiking, trekking, camping, hunting, biking, daily, etc.