This OG 507 Fatigue Shirt, short sleeve, is an authentic US Military surplus item made from a durable poly cotton dura press fabric. In the mid 1970's, it replaced the OG 107 100% cotton design due to its increased durability. Featuring a simple design with 2 chest pockets and a button up front this shirt is suitable for various activities, from city life to outdoor adventures. It conforms to US Military Specification Sizing for a perfect fit.