The purpose of a wine glass stem is to provide a place for you to handle the glass and avoid changing the wine's temperature. You should hold a wine glass by its stem so white wines stay cool and red wines don't warm any more than necessary. So what about the new stemless wine glasses? If you use them properly and fill them only one-third full to allow room for swirling the wine, you will still have ample room to handle the glass at the top. This way, your warm hands don't warm the wine.