Product Design

Can you guys make hats that have expressions on them like "got Arduino?" or "/string "you know C++ language?";"

Don't understand your question?

hats are shields for RPI? or do you mean things to wear on your head?

no no no
why you need this?

Do you mean hats with the led matrices on them?

I thinks he means merch. In which case he is talking about Arduino-style blue baseball caps and t-shirts with nerdy, Arduino-related phrases in white, Arduino-style text alongside the Arduino Logo.