You will find that the sizing goes from small to 5XL here.
Patriotic MMA Freedom 250 USA 1776-2026 Shirt
What stands out about the short sleeve is the smooth finish around the armhole.
WARRIOR INTERNATIONAL MMA MEN BLACK T SHIRT
What stands out about this product is the straightforward multiple size selection.
Under Armour Shirt Mens Large Black USA One Nation Flag Graphic Tee Patriotic
You will notice the stitching is reinforced on this tee.
Retro MMA Legends Shirt Freedom 250 Vintage Combat Event Tee
A nice touch is that you can order this tee in S through 5XL.