"What Don't You Understand" T-Shirt
What part of this classic Navier-Stokes equation don't you understand? Not only is this witty fluid dynamics tee a gas to wear, but it's sure to impress all those you encounter!
Material: 100% Preshrunk Heavyweight Cotton
How to measure: With arms down at sides, measure around the upper body, under arms and over the fullest part of the chest.