The Guardian long & short sleeve shirts feature a semicompression underlayer from the lower chest to the waist, constructed with VaporCore™, powered by 37.5® Technology, designed to comfortably conceal and allow fluid access to firearms without chafing the skin.
Got my shirt in a few days ago, was concerned it may shrink if washed/dried on high heat [by accident if the wife threw it in w/the rest of my stuff]...Vertx customer support ensured me it wouldn't shrink which is good to know. I'm 5'9" and 180 pounds, 32-inch waist, Olympic lift and powerlift on the reg & have a medium frame [mostly muscle, little chub]. Shirt fits perfect; not too baggy, not too long, just right. Loving the little pockets near the bottom front inside of the shirt for washers to weigh the shirt down for clearance, even used the comms loop for my cell phone earbuds today while in the office in Silicon Valley. Keep these bad boys coming, and make em in SOLID colors as well, so I can buy more of them....I have too many plaid shirts as is :)