The sound of silence is ideal for Grumpy Cat! Bring the famous Grumpy Cat meme to your closet with the Grumpy Cat Shut Up Heather Royal Blue Racerback Tank Top. This funny tank top reads "I like the sound you make . . . when you shut up" next to Grumpy Cat's frowny face. 50% Polyester, 25% Cotton, 25% Rayon.