If you work with heavy objects or equipment, including heavy objects or equipment that's hoisted overhead, steel toe boots are a must. Many employers will require steel toe boots, and some professions are mandated to do so by federal law.
Wondering how to clean work boots? At some point you will want to. After all, they can get caked with dirt, dust, oil, and other substances until you're told that they stay outside or you do with them on!