WARNING! This product will melt when exposed to extreme heat or open flames, posing a risk of serious injury where melted product comes into contact with skin!. Durable, lightweight, field-tested fabric. Zoned-in underarm and side venting to keep you comfortable and focused. 4-way stretch fabrication improves mobility and accelerates dry time, while maintaining shape. Superior Moisture Transport System to keep you cool, dry, and comfortable. ArmourBlock® anti-odor technology prevents the growth of odor-causing microbes to keep your gear fresher, longer. 30+ UPF protects you from the sun's harmful rays. On-sleeve pen holder for easy access for the professional in the field. Ribbed collar and custom Under Armour® 3-button placket for comfort and durability. Shoulder mic socket. Polyester/Elastane. Imported.