Choosing running shoes

The specifications that actually describe something:

Dropalso: offset, heel-to-toe drop

The height difference between the heel and the forefoot, in millimetres. A higher drop tilts you forward slightly; a lower one loads the calf and Achilles more. Most road shoes sit between 4mm and 12mm.

Stack height

How much material sits between foot and ground. More stack means more cushioning and generally a less connected feel; less means the opposite.

Neutral and stabilityalso: support shoes, motion control

Neutral shoes do nothing to influence how the foot rolls. Stability shoes include structure intended to resist inward roll. Which of these suits a given runner is much less settled than shop displays suggest.

Plated

Containing a rigid plate, usually carbon, within the midsole. Designed for racing, typically with a shorter usable life and a higher price than a training shoe.

Last

The shape the shoe is built around, which determines how wide and how deep it is. Two shoes with identical specifications on paper can fit entirely differently because of this.

The standard shop procedure is to film you running on a treadmill, observe how much your foot rolls inward, and recommend a shoe category accordingly. The observation is real: feet do differ in this, and the video shows it.

What is less secure is the step from that observation to an injury-prevention claim. The idea that matching shoe category to foot roll reduces injury has been examined repeatedly and the results have not settled the question, which is why the confident version of the advice has quietly softened in recent years. Treat gait analysis as one useful input, offered by somebody who also sells shoes, rather than as a diagnosis.

Fit beats specification, and it is the one thing you can assess yourself. Feet swell during a run, sometimes by a noticeable amount, so a shoe that fits precisely in a shop at ten in the morning can be too small at kilometre twelve. The conventional allowance is a thumb’s width of space in front of the longest toe, which is usually about half a size longer than an everyday shoe.

Width is the specification nobody checks and the one that causes the most trouble. A shoe that is the right length and too narrow produces numbness, black toenails and blisters on the side of the foot, and no amount of lacing fixes it. If a brand consistently feels tight across the forefoot, that is the brand’s last rather than your feet.

Practical rules that hold regardless of model:

• Try them at the end of the day — Feet are larger then, which is closer to their state during a run.
• Wear the socks you run in — A technical sock and a thick cotton one are half a size apart.
• Run in them if you can — Many shops allow it and a shoe feels different at running cadence than it does walking.
• Buy last season’s model of a shoe that works — The reliable saving in running. Manufacturers revise shoes annually, and the previous version is frequently discounted heavily and is not worse.
• Change one thing at a time — Moving to a much lower drop or a much firmer shoe alters where the load goes. Doing it gradually is the difference between an adjustment and an injury.