One of Your Feet Is Bigger. Here Is Why That Matters for Fit.

Asymmetry between the two feet is the normal state rather than the exception. For most people the difference is small enough to ignore, and for a meaningful minority it is large enough to matter a great deal.

The problem is that almost nobody accounts for it, because shoes are sold in pairs and we are trained to think of ourselves as having one shoe size.

Fit to the larger foot

This is the whole of the practical advice, and it is worth stating plainly because people routinely do the opposite.

A shoe that fits the smaller foot correctly will be tight on the larger one. Tightness across a working day produces rubbing, pressure on the toes and compressed forefoot, which is precisely the mechanism behind a good proportion of the complaints people put down to long hours.

A shoe that fits the larger foot leaves the smaller one slightly roomy, which is a far easier problem to solve. Lacing, a thicker sock or an insert takes up the slack without doing any harm.

Buy for the bigger foot and adjust the other one. The reverse cannot be fixed.

Feet change through the day

The second thing that undermines fit is that your foot is not the same size at nine in the morning as it is at seven in the evening.

Standing and walking cause a normal amount of fluid to accumulate in the lower limb, and feet spread and swell across the day. Heat increases it. A long shift increases it considerably.

Which means a shoe fitted first thing, in a cool shop, on a foot that has not yet done anything, is being fitted at the smallest it will be all day.

The practical version of that is to try shoes on later rather than earlier, and to try them wearing the socks you actually work in rather than whatever you happen to have on.

Size is not a fixed property

Adult feet change over time. They tend to lengthen and broaden with age as the soft tissues that hold them together become less taut. Pregnancy commonly changes foot size, sometimes permanently. Significant changes in weight alter loading.

None of that is a problem in itself. It only becomes one because people carry on buying the size they have always bought.

Measuring both feet occasionally, rather than assuming, catches this. Most decent shoe shops will do it, and it takes a minute.

What good fit actually looks like

Enough room at the front that the longest toe, which is not always the big toe, is not touching the end when standing.

The widest part of the foot sitting at the widest part of the shoe, rather than forward or behind it.

The heel held without slipping, since a heel that moves is a heel that rubs.

Comfortable immediately. The idea that shoes need breaking in is largely a hangover from stiffer materials and it causes a lot of avoidable damage. A shoe that hurts in the shop will hurt on shift.