"Keep Calm and Mine Bitcoin" sounds cool.
The design of the t-shirt is good but I am concern about the quality of the cotton.
You have to clear the quality of t-shirt also.
That is one of my favorites - glad you like it!
The shirts are pre shrunk cotton name brands, however I recommend to air dry rather than put them in the dryer.
Especially for the sales that I always going on, they are definitely worth it and all shirts and shorts will withstand any weather.