To start, make sure you’re either barefoot or wearing the socks you intend to wear with the shoe.

Next, place a piece of paper on a flat, hard surface, and step your foot firmly onto the piece of paper. Keep in mind that your full weight should be on the foot you are measuring.

Lastly, use a pencil or a ballpoint pen to trace your foot, keeping it at a 90 degree angle to the piece of paper. Repeat the process for your other foot.

Using the tracing, measure the maximum length of your foot by drawing a straight line from the back of the heel to the top of the longest toe. Use the length of the longer foot to determine your shoe size.