Stand up straight with your back against the wall. Place a piece of blank paper under your foot, making sure both your heel and the paper are flush against the wall.
Have a friend mark the longest part of your foot on the piece of paper. This measures your heel-to-toe length.
Use a ruler to measure your heel-to-toe length, and repeat with the other foot!
If you have questions we haven't answered here, please feel free to contact us at firstname.lastname@example.org. We are more than happy to answer any questions you have to ensure you get the right slipper.
Please note that just as every foot is a unique shape and size, so are the slippers. These values are a close approximation, but we cannot guarantee an exact match.