This tee is by Next Level apparel and runs smaller then a normal tee shirt.  It is 100% cotton.  Approximate measurements are below, first measurement measures from the neck to the bottom of the tee, and the second measures the width.

S- 27" x 18"

M- 29" x 19"

L- 30" x 20"

XL- 30" x 23"

XXL- 32" x 24"