Saucony and Mizuno running shoe sizes both anchor to foot length in centimeters, so switchers should match centimeters rather than US numbers. What changes between brands is width codes, model-specific fit, and available size ranges. A last is the foot-shaped mold that sets a shoe's length, width, and toe shape. Because fit varies by model and last, the same centimeter length can feel different when you change brands.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- Why US numbers do not transfer directly
- What width letters mean
- Which models fit narrow
- How to switch without guessing
Why US numbers do not transfer directly
Saucony's official chart converts the same foot across US Men/Unisex, US Women, inches, UK, EU, and Japanese centimeters. According to Saucony, that shared centimeter length is the point to match in Saucony's universal size chart.
Mizuno Singapore uses the same centimeter-anchored approach for Men's US, Women's US, EU, and Japan sizes. Measure both feet heel to longest toe in centimeters late in the day. Use the longer foot as your size, then find that centimeter value on the other brand's chart.
What width letters mean
Mizuno defines men's D as standard width and 2E as wide. It defines women's B as standard and D as wide, so a Saucony wide wearer should check the letter code.
According to Mizuno Australia, the name alone does not transfer in Mizuno Australia's sizing tips. Many Saucony models come in multiple widths, including wide and extra-wide. That choice helps runners who need more toe or midfoot room without adding length.
Which models fit narrow
Some Saucony performance models fit narrower than the brand average. According to the Sneakerjagers Saucony FAQ, Kinvara and Endorphin Pro have a narrower fit that may require going up half a size.
Mizuno's Wave Rider 29 flagship daily trainer rates true to size in length. According to WearTesters, knit and snug performance variants narrow the toe box and commonly prompt a half-size increase in the WearTesters performance review.
How to switch without guessing
A brand comparison reports Saucony men's 5-16 and women's 5-12 versus Mizuno men's 7-16 and women's 6-12. According to that Onclouder comparison, runners at the smallest sizes should verify availability before switching.
Fit still shifts by model, so use one routine each time you convert sizes: Mizuno Australia also advises ordering running shoes one-half to one full size larger than normal dress shoes. That extra room allows for swelling and forward elongation during runs.
- measure heel to longest toe in centimeters late in the day
- match that number on the new brand's chart
- keep about a thumb's width or half-inch ahead of the toes
- recheck width letters against the new brand's standard and wide marks