If it’s a particularly hot and humid day, you’ll want to keep a few tools in your purse. “Blotting papers are always a good little staple to have,” says Kerry Cole, style director for Becca Cosmetics. For an extra investment, Cole loves the Ever-Matte Poreless Primer ($44, sephora.com)—it behaves like liquid blotting paper, and lasts all day. You may want to bring your deodorant with you, too—we love the Dove Antiperspirant Spray ($6, drugstores), because you can spray it on in the office bathroom and it dries instantly. That means no white residue on your clothes or skin.