The ACU surplus Combat shirt is the ready to use and real issue.  They are meant to fit snug giving you a comfortable wicking front and durable sleeves for protections. We find them to be perfect for bushcraft, outdoors and rang training.  The cool front is meant to be comfortable and less bulky when wearing a tactical vest.  Note that they may be a mix of brands from Massif, Tru-Spec or Propper.  

Features & Specs of the ACU Surplus Combat Shirt

• U.S. military issue ACS (Army Combat Shirt)
• Made in USA
• ACUPAT Camo (Army Combat Uniform Pattern)
• Stand-alone Shirt for Army Combat Uniform
• Fits under Improved Outer Tactical Vest
• 4-way stretch fabric is ready to move
• Resistant to flame and flashes of high heat
• Lightweight abrasion-resistant elbow pads