You're an adult now, so you not only think about boring shit like placemats, but you actually spend your hard-earned money on them instead of, you know, booze and morning after pills. How does this happen? Well, you get older, you start making more money (hopefully), and you decide that you want to be surrounded by nice things. So you decide to drop a lot of cash on a dining room table, since you had been using your coffee table as your desk/dining room table/only table in your apartment for years. You not only want your precious dining room table to look good, you want to protect it, so that's how we get to purchasing placemats.
If you're going to purchase a set of placemats, you can't go wrong with these Grovemade Placemats ($49). Made out of sanded and scored wood and backed with luxe wool felt, they'll add style to your decor and protect that baller dining room table from scratches and water marks. Because you care about that shit now.