As you go about your day, the neurons in your brain are busy making different kinds of brainwaves. These electrical pulses change frequency depending on what you're up to – while you're working or studying, you're making beta waves, when you put your feet up at the end of the day to just chill, you're rocking some alpha waves, as you slip into dreamland you're pumping theta waves, and while you're meditating, you're making delta waves. 

This steel gray (matter) shirt is perfect for your cognitive psychology lab partner, your favorite neuroscience nurse or your brainy self!