The shirt reads: "Fully vaccinated. You're welcome."
Carson and Karen Bennett created the shirt for their company "Tiny Torsos."
They say the idea was inspired by their own children.
The Bennett’s said they initially sold four or five shirts online.
But sales took off after news of a recent measles outbreak in Disneyland.
Now, they say they've sold more than 200 shirts.
The shirts were originally just for kid, but the company is now making shirts for adults too after numerous requests.
For each shirt sold a dollar is donated to a nonprofit raising awareness on the importance of getting kids fully vaccinated.