Brannock measures your foot; calipers measure the shoe. We log both, plus heel-to-ball and a 20 km heel-slip check, before choosing a streetwear size. Here are the numbers we actually act on.
Editor score 4.5 / 5
Most sizing arguments break down for the same reason: a Brannock reading describes a foot, and a size chart describes a last. Those are two different objects. We measure both before we commit to a size, and the gap between them is where nearly every too-small streetwear pair is born.
Brannock gives you two lengths, and the bigger one wins
Brannock's own fitting instructions are blunt about this: the device records heel-to-toe length and heel-to-ball arch length separately, and you fit to whichever is longer.
If the arch length is larger than the heel-to-toe length, then fit to the arch length.
On our bench the pattern repeats constantly. Our benchmark right foot measures 271 mm heel-to-toe and 165 mm heel-to-ball — Brannock 9.5 D — while the left sits a half size under at 9 D. The left foot never gets the last word. If your arch length lands a half size above your heel-to-toe number, drop the toe reading and size from the arch, because a shoe that flexes behind the ball of your foot will rub the toes even when the length is technically correct.
The caliper numbers we actually act on
Once a pair lands, we measure the same three zones on both shoes with digital calipers and log the batch code beside them. These are the readings from a recent US 9.5 test pair, and what each one decides.
| Heel-to-toe interior length | 279 mm | Target 8–12 mm over the 271 mm foot; 8 mm or less goes back up a half size |
| Midfoot interior width | 96 mm | If your foot is wider and the upper is not knit, change the model, not the size |
| Toe box interior height at the flex point | 26 mm | Under 25 mm, thick socks and square toes are out |
| Heel counter length | 62 mm | A short counter on a low-volume heel means movement before the upper relaxes |
| Pair weight, no box | 682 g | Heavier builds hold shape; light knit uppers relax about 2 mm |
| Parcel weight with box | 1,078 g | The box adds 396 g — pull it before shipping a multi-pair haul |
Note the pattern: 279 mm over a 271 mm foot is 8 mm of clearance, which reads generous in a leather boot and tight in a knit runner. Material changes the target, not the measurement. That is why we keep blanket "size up half a size" advice out of the fit table — it is half a size wrong as often as it is right.
Converting to the number you type into the cart
Listings sourced through the Kako Buy agent flow usually quote Chinese foot length in millimetres, where a CHN 270 means a 27 cm foot. Those tables disagree with each other at the half-size level. Our 271 mm foot lands on CHN 270 on one brand's chart, EU 43 on another and EU 44 on a third, with US men's 9.5 and 10 both claiming it.
The fix is to convert once. Take your longer foot in millimetres, match it to the millimetre column, and treat the EU and US rows as decoration. If a listing only offers UK or EU sizes, ask the agent for the insole length in millimetres before ordering, not after.
What changes at 20 km, 50 km and 150 km
Our route is a 20 km mixed loop of sidewalk, gravel and wet asphalt. At 20 km we mark heel position on the sock: more than 6 mm of movement in a properly laced pair means the heel counter is short for your foot, and going up half a size makes it worse, not better. At 50 km the knit upper on this pair had relaxed roughly 2 mm across the midfoot and left-side heel slip had grown to 9 mm. At 150 km the numbers stabilized, but midsole compression had taken 3 mm off the interior toe-box height, from 26 mm to 23 mm.
That last figure is the one most buyers misread. A pair that felt correct at unboxing can feel short at 150 km because the shoe shrank around the foot, not because the size was wrong. If you do one thing after the first month, re-measure the interior length with the same calipers and compare.
One size or two in the cart
Our rule set is deliberately dull, and it settles most orders without a second parcel:
- Your longer foot sits within 3 mm of the top of a size band — take the larger size.
- Arch length is a half size above heel-to-toe — size from the arch length.
- Length is fine but width pinches — change width or model, never both at once.
- You plan thick socks or an aftermarket insole — add 5 mm to the clearance target.
- You are between two sizes with a knit upper — take the smaller one; the upper will give, the midsole will not.
Before the parcel ships, ask for two seller-facing figures: a photo of the insole with a tape measure laid across it, and the shoe's own weight. An insole measurement ends more sizing disputes than any published chart, and the weight tells you whether a two-pair order stays inside a cheaper shipping band once boxes come out.
Verdict
Brannock plus calipers is not a perfect system — no measurement predicts how a specific knit will relax — but it is the only method we have found that calls the right streetwear size before the second order. We rate it 4.5 / 5. The missing half point belongs to material behaviour, and that can only be settled on the wear route. Buyers who skip the arch-length reading and order straight from a US-to-EU chart are the ones we see paying return postage twice.