In case you've run out of excuses for another summer bbq, these concrete tumblers from 25togo are surely the most stylish (and stable) reason to test your cocktail skills with both guest and stranger alike. The sleek combination of concrete and glass has a mid-century mod look that sparks images of how Neutra and the Eames' might enjoy cocktails on a sunny day. On top of the obvious functionality and aesthetics, I'm wondering if the concrete might actually act as a kind of built in coaster when the glass really starts to sweat. At $40/pair, I'm willing to take a chance.