Arthur has the deepest of thoughts. And of course they are worth putting on a mug. "I'm not grumpy. I'm just easilty irritated by everything".
He is also always up for wearing a sweater... So the confluence of these two things created a cool mug for you. 
The mug is 11 oz., BPA and Lead-free, microwave & dishwasher-safe, and made of white, durable ceramic