I had to look at almost every Big Bang shirt available through Amazon in order to find one that is available in XXX-Large to give my Big and Tall Hubby as a birthday gift.  I was skeptical of the sizing since most shirts I've ordered from other places run small or are made of thin, inferior material.  When this shirt arrived I was very pleased with both the sizing and quality of the shirt and my Hubby is very happy with his birthday gift.