The design that started a movement. When we developed the first version of our signature shirt, we had no idea that it would lead to such widespread adoption of our basic design. The COMBAT SHIRT AC FR is a purely operational upper garment. This shirt is designed specifically to be worn under body armor. It keeps you cool with a lightweight high-performance flame resistant DRIFIRE^® torso, and reinforced Defender M Ripstop sleeves designed for use with our patented removable AIRFLEX™ ELBOW PADS (sold separately). Features a zip collar that allows easy donning and doffing while keeping slings, straps, and brass off your neck. Patented, see www.lwpatents.com. Made in US from US materials.