Shoe Kung Fu

Fit report · Running · r_sample_running

Sample report

Not yours. Feet measured with a Brannock device, shoe interiors from RunRepeat lab data converted to her size. Shown to explain the layout.

Your size

Women's 9, wide (D)

Your size is Women's 9, wide (D) F5F6.

Our top pick is the HOKA Gaviota 6 in W9.5, Extra wide (2E) F8F9.

In Nike, Brooks, ASICS, New Balance, HOKA and Saucony sizing that is the same as a men's 7.5 D.

Unvalidated range: our 20-person accuracy study is still running

#1Top pick for running · lab-derived, modeled for your size

HOKA Gaviota 6, women's

Order W9.5 · also W10 in Extra wide (2E)

Room across the ball+4.5 ± 2.4 mm
Room past your toes+10.2 ± 2.1 mm

No fit risks flagged.

Gaviota 6: order W9.5 F9; W10 leaves 14.5 mm past your toes if you want more room F10.

Shop at fleetfeet.com

Stock not checked. We may earn a commission; it never changes the ranking.

Your feet

Left foot

Length
248.1 mm± 1.7Sets your length
Ball width
91.9 mm± 1.2
Heel width
Not measured

Right foot

Length
245.5 mm± 0.8
Ball width
94.3 mm± 0.5Sets your width
Heel width
Not measured

Your right foot is 2.4 mm wider across the ball F4F2. Shoes that fit your left may pinch your right, so every shoe below is checked against your right foot.

Your left foot is the longer one at 248.1 mm F1F3, so toe room is measured against it.

Estimated ranges, not yet validated.

Ranked for running

Room is the shoe’s inside minus your foot, at the size we list. Below zero means the shoe is narrower than you.

#Shoe and sizeAcross the ballPast the toesRisksData
1
HOKA Gaviota 6, women'sW9.5 · also W10Extra wide (2E)Stock not checked
Shop at fleetfeet.comSource F8F9F10
+4.5 ± 2.4 mm
+10.2 ± 2.1 mmNone flaggedLab-derived
2
HOKA Clifton 11, women'sW9.5 · also W9Extra wide (2E)Stock not checked

Clifton 11: order W9.5 F12; if you like a snug fit, W9 leaves 9.1 mm past your toes F13.

Shop at fleetfeet.comSource F11F12F13
+2.0 ± 2.4 mm
+13.3 ± 2.1 mmNone flaggedLab-derived
3
On Cloud X, women'sW10 · also W9.5Standard (B)Stock not checked

Cloud X: order W10 F15; if you like a snug fit, W9.5 leaves 8.3 mm past your toes F16.

Shop at fleetfeet.comSource F14F15F16F17
+2.0 ± 2.9 mm
+12.6 ± 2.1 mmNone flaggedLab-derived
4
Altra Torin 9, women'sW10 · also W9.5Wide (D)Stock not checked

Torin 9: order W10 F19; if you like a snug fit, W9.5 leaves 8.4 mm past your toes F20.

Shop at altrarunning.comShop at fleetfeet.comSource F18F19F20
+1.8 ± 1.4 mm
+12.7 ± 2.1 mmNone flaggedLab-derived
5
Brooks Glycerin 23, women'sW9 · also W9.5Extra wide (2E)Stock not checked

Glycerin 23: order W9 F22; W9.5 leaves 14.1 mm past your toes if you want more room F23.

Shop at fleetfeet.comSource F21F22F23
+1.8 ± 2.4 mm
+9.9 ± 2.1 mmNone flaggedLab-derived

“Lab-derived” means a lab measured the shoe’s interior and we model it for your size. “Estimated” shoes have no lab interior at any size near yours; they can appear here but never rank first. Risks are rules of thumb from your numbers against the shoe’s. Shop links may earn us a commission; it never changes the ranking.

Why this order

The Gaviota 6 leaves 4.5 mm across your right ball F8 and 10.2 mm past your toes F9.

The Clifton 11 leaves 2.0 mm across your right ball F11 and 13.3 mm past your toes F12.

The Cloud X leaves 2.0 mm across your right ball F14 and 12.6 mm past your toes F15.

The Cloud X is listed but can't be our top pick: the pre-2025 width method F17.

The Torin 9 leaves 1.8 mm across your right ball F18 and 12.7 mm past your toes F19.

The Glycerin 23 leaves 1.8 mm across your right ball F21 and 9.9 mm past your toes F22.

Every inside measurement in this report comes from RunRepeat's lab F24.

Every sentence here is filled in from the numbers above, and each links to where its number came from.

Compared to your adidas Adizero EVO SL

Inside measurements of each shoe. All figures in millimeters.

ShoeWidest insideAt the toesToe-box height
Your adidas Adizero EVO SLreference97.571.628.1
HOKA Gaviota 697.276.728.2
HOKA Clifton 1194.770.927.4
On Cloud X102.781.7Not published
Altra Torin 997.782.225.8
Brooks Glycerin 2396.173.927.7

Against your Adizero EVO SL, the Gaviota 6 is 5.1 mm wider around the toes F25F26.

Test at home before you wear them outside

Indoors, on a clean floor, so either pair can still go back.

  1. Stand on the insole

    Pull it out, put it on the floor and stand on it. If your foot spills past the edge, the shoe is too narrow. Your wider foot decides.

  2. Thumb check

    Standing, you want 9 to 14 mm, about a thumb's width, between your longest toe and the end of the shoe.

  3. Heel lock and stairs

    Lace through the top eyelet with a heel-lock loop, then walk up a flight of stairs. Your heel should barely lift.

  4. Keep one, return one

    Ordered two sizes? Keep the pair that passes all three checks and send the other back unworn.

What happens next

Questions about this report? Reply to the email it came in.

  1. Day 7A one-question email: did you buy, and what?
  2. Day 3030 days after your shoes arrive, an email with your check-in link: did they fit, and where did they pinch?
  3. Re-fitIf our #1 pick doesn’t fit, we keep re-fitting for free until it does. Tell us the shoe and size you tried and what felt wrong.
  4. PhotosDeleted 30 days after this report. Your measurements stay with your order unless you ask us to delete them.

Where every number comes from

  1. F1Left foot length 248.1 mm, from a Brannock reading. Longer of your two feet, so it sets the length.
  2. F2Right ball width 94.3 mm, from a Brannock reading. Wider of your two feet, so it sets the width.
  3. F3Right foot: length 245.5 mm, ball width 94.3 mm.
  4. F4Ball widths differ by 2.4 mm: right 94.3 − left 91.9 = 2.4 mm.
  5. F5Size: 248.1 mm = 9.768 in. Brannock men's size = 3 × 9.768 − 22 = 7.30, rounded up to the next half size: men's 7.5 = women's 9 (women's = men's + 1.5 at most athletic brands).
  6. F6Width: right ball 94.3 mm against a Brannock D at men's 7.5, 93.7 mm (one letter = 4.8 mm): D + 0.1 letters, so women's wide (D).
  7. F7Rules of thumb (rules v0.4, unvalidated): ball room under 1.0 mm flags pressure at the ball; under −4.0 mm a shoe is left out; target toe room for running is 9.0–14.0 mm; more than 2.0 mm under that flags short toe room; a women's foot in a men's or unisex last flags heel slip.
  8. F8HOKA Gaviota 6 W9.5 inside width 98.8 mm: lab 97.2 mm at men's 9, minus 3.2 mm for one size down and plus 4.8 mm for one width step wider (2E vs the lab's D). Room 98.8 − 94.3 = 4.5 mm.
  9. F9Gaviota 6 W9.5 inside length 258.3 mm: lab 266.8 mm at men's 9, minus 8.5 mm for one size down. Toe room 258.3 − 248.1 = 10.2 mm.
  10. F10Gaviota 6 W10 inside length 262.6 mm. Toe room 262.6 − 248.1 = 14.5 mm.
  11. F11HOKA Clifton 11 W9.5 inside width 96.3 mm: lab 94.7 mm at men's 9, minus 3.2 mm for one size down and plus 4.8 mm for one width step wider (2E vs the lab's D). Room 96.3 − 94.3 = 2.0 mm.
  12. F12Clifton 11 W9.5 inside length 261.4 mm: lab 269.9 mm at men's 9, minus 8.5 mm for one size down. Toe room 261.4 − 248.1 = 13.3 mm.
  13. F13Clifton 11 W9 inside length 257.2 mm. Toe room 257.2 − 248.1 = 9.1 mm.
  14. F14On Cloud X W10 inside width 96.3 mm: lab 102.7 mm at men's 9, minus 1.6 mm for half a size down and minus 4.8 mm for one width step narrower (B vs the lab's D). Room 96.3 − 94.3 = 2.0 mm.
  15. F15Cloud X W10 inside length 260.7 mm: lab 264.9 mm at men's 9, minus 4.2 mm for half a size down. Toe room 260.7 − 248.1 = 12.6 mm.
  16. F16Cloud X W9.5 inside length 256.4 mm. Toe room 256.4 − 248.1 = 8.3 mm.
  17. F17On Cloud X: RunRepeat measured its width with the pre-2025 caliper method, which doesn't line up with today's gel-mold numbers, so we list it but can't make it our top pick until it's re-checked.
  18. F18Altra Torin 9 W10 inside width 96.1 mm: lab 97.7 mm at men's 9, minus 1.6 mm for half a size down. Room 96.1 − 94.3 = 1.8 mm.
  19. F19Torin 9 W10 inside length 260.8 mm: lab 265.0 mm at men's 9, minus 4.2 mm for half a size down. Toe room 260.8 − 248.1 = 12.7 mm.
  20. F20Torin 9 W9.5 inside length 256.5 mm. Toe room 256.5 − 248.1 = 8.4 mm.
  21. F21Brooks Glycerin 23 W9 inside width 96.1 mm: lab 96.1 mm at men's 9, minus 4.8 mm for 1.5 sizes down and plus 4.8 mm for one width step wider (2E vs the lab's D). Room 96.1 − 94.3 = 1.8 mm.
  22. F22Glycerin 23 W9 inside length 258.0 mm: lab 270.7 mm at men's 9, minus 12.7 mm for 1.5 sizes down. Toe room 258.0 − 248.1 = 9.9 mm.
  23. F23Glycerin 23 W9.5 inside length 262.2 mm. Toe room 262.2 − 248.1 = 14.1 mm.
  24. F24Source: every shoe's inside measurements come from RunRepeat's lab (runrepeat.com), which cuts each shoe in half and measures a men's pair in medium width at its lab size. Shoes labeled "Lab-derived, modeled for your size" start from those lab numbers; the engine models them to your size and width.
  25. F25adidas Adizero EVO SL lab interior at men's 9: widest 97.5 mm, around the toes 71.6 mm.
  26. F26Gaviota 6 lab around the toes 76.7 mm: 76.7 − 71.6 = 5.1 mm against the Adizero EVO SL.

Width ranges combine the camera’s error with shoe-to-shoe variation.

Report r_sample_running · engine 0.3.1 · shoe data 2026-10-16 · rules 0.4

Fit guidance, not medical advice. If you have a bunion, neuroma or diabetes, see a podiatrist first.