Scientifically Engineered as the ultimate combat shirt. Our 5.11 Rapid Assault Combat Shirt retains and expels heat in relation to the body's optimal humidity temperature. Ideal for wear under tactical vests, chest harnesses and body armor, this shirt is chemical-free, ultra-durable and combines quick-drying and moisture-wicking technologies. It features dual bicep pockets with Velcro closures and an anti-chafe suede collar suited for comfortably wearing with armor or a sling pack. The quarter zip front makes adapting to varying climates quick and easy, and the traditional military style cuffs allow for a customizable fit. The elbows are double-reinforced and double-articulated for durability and maneuverability, ensuring a full range of motion that will not slow you down in the field. This shirt has been designed to endure rugged and hardworking tactical use.