When it comes to shoes, no brand expects you not to try them on when you get them home. But while trying them on and walking around in them is encouraged to gauge fit, taking them out on the road or the town might be a different story. In general, it’s always a good idea to try shoes out on clean surfaces to keep them as clean as possible in case you have to make a return. There are exceptions to this rule when it comes to running shoes in particular, though. Zappos, for example, allows you to try (and wear, and run in) running shoes for 30 days before making your final decision. If you don’t like them, you can return them for a full refund, no matter how many times you’ve worn them. Brooks Running has a similar offer on their running shoes, except it’s a 90-day policy. In other words: If you’re buying running shoes, there are plenty of options that allow you to wear the shoes and return them if they’re not right, so be sure to choose your retailer carefully.