Just recieved this shirt in 4XLT. Great fit. I checked the shirt's construction and there is no vertical seams that run on down on the side. That means that this shirt is made of a tubular knit. I did not have the best experience with this type of construction as shirts shrunk rapidly and lost length. As a 6' 5" guy I need my shirts to maintain their length wash after wash. Will update this review to document experience with this shirt.