Each t-shirt needs a specific treatment to guarantee its longevity wash after wash, even more so when it has a print. The secret is simply knowing, before washing the t-shirt, the label inside it.
In this case, to protect the delicate fiber of a cotton t-shirt there are 3 golden rules :
1 - Wash the t-shirt inside out at 30°C.
2 - Prefer to dry outdoors.
3 - Iron the t-shirt inside out, at a medium temperature and without steam.