Measure foot length from heel to longest toe
Measure both feet and use the larger measurement
Measure foot width if width sizing is available
Compare measurements to a shoe size chart
Check the brand’s specific size guide
Try shoes on later in the day when feet are slightly larger
Wear the socks you plan to use with the shoes
Leave about a thumb’s width of space at the toe
Walk in the shoes to check fit and comfort
Confirm the heel does not slip and the toes do not feel cramped