How to Accurately Measure Your Feet to Find Your Shoe Size. Nike.com

When you take your new shoes out of the box, it’s important to try them on and make sure they fit. Take a stroll or a jog in your new shoes, either on a treadmill or outside on the sidewalk. Nike offers a 60-day return policy for U.S. customers (some restrictions apply), which gives you time to test out your new shoes before making a decision.

When you first try on your shoes, check to make sure there is space in the toe box to wiggle and stretch. Then, walk around in your shoes. Check to make sure your foot doesn’t slip in and out of the shoe and the ankle collar doesn’t rub. Both are signs of an ill-fitting shoe. You’ll also want to take your shoes for a longer test walk or run to make sure they have enough cushioning and support. Pay attention to any pressure points that could cause discomfort in the long-term. Confirm that the width feels right.

When buying shoes, you can't always expect shoe fit to improve after a break-in period, so trust your gut when it comes to the initial feel. If you have any doubts about whether your shoes fit, send them back and try another size or style. It's important to land on the correct shoe size for your feet.