Nerd Think like a Proton Positive T-shirt XS

This is a nerd shirt, "Think like a Proton Positive" T-shirt. There is no size tag, but measures about 17" from armpit to armpit and 26" from back center neckline to bottom. Pre-owned, spot on upper back near collar ... see pic. If you need to sign up for Poshmark, use MAKEMYDAY808 as the invite code to receive a $10 Posh credit. CB208