Where 1 + 1 = LOL. Remember when elementary school math was just apples and oranges? Well, we brought it back—only now it’s cooler, cleverer, and wearable. Sum Shirts combine 2 to 5 everyday words into one perfectly punny equation. It’s not rocket science (thankfully), but it is ridiculously fun. Add ‘em up, show ‘em off, and get ready for people to do a double-take at your clever shirt math. Who knew addition could be this amusing?