This You Me At Six Block Logo t-shirt is officially licensed and manufactured by Live Nation.  The front is screen printed on a cardinal t-shirt made from 100% cotton.  No design is on the back.

Size,          Brand,        Armpit to Armpit, Top to Bottom
Medium     Tultex                    19"                  29"
Large         Tultex                    21"                  31"
X-Large     Tultex                    23"                  31"
2X-Large   Tultex                    25"                  32"