Sidas Size Chart

This is our Sidas size guide for running insoles. Sidas insoles are sized by foot length, and each size covers a range of shoe sizes. Measure your foot length in centimetres, or use your usual shoe size, and find your size in the chart below. Sidas insoles are trimmed to fit your shoe before use. If you're not sure, it's always best to get fitted at your local running store.

Sidas Insole Size Chart

Sidas insole fitting steps: 1 remove the shoe's original insole, 2 trim the Sidas insole to fit, 3 slide the new insole into the shoe

For the Sidas running insoles we carry (sizes S to XXL). Sizes aren't split into men's and women's.

Sidas insole sizes by foot length (cm), EU and US shoe size
Size Foot length (cm) EU US
S 23.5–24.5 37–38 5–6
M 25–26.5 39–41 7–8
L 27–28 42–43 9–10
XL 28.5–29.5 44–45 11–12
XXL 29.5–32 46–48 13–14

How to measure

  1. Measure your foot length in centimetres, from your heel to your longest toe, wearing the socks you run in.
  2. Find your foot length in the chart. If you'd rather use shoe size, Sidas also lists EU and US sizes.
  3. Remove the original insole from your shoe and trim the Sidas insole to fit before you use it.

Fit tips

  • Trim before use: Sidas says to cut the insole to fit before use, then remove your shoe's insole and replace it with the new one.
  • Arch type: Sidas suggests comparing the footprint of your bare foot to their arch template to check your arch type.

These charts are a guide, not an exact fit. Sizing can vary between insoles and with the shoes you wear them in.

Sidas Sizing FAQ

What size Sidas insole do I need?

Match your foot length or shoe size to the chart. For example, a foot length of 27–28 cm (US 9–10, EU 42–43) is a Large.

Do I need to trim Sidas insoles?

Yes. Sidas says to cut the insole to fit your shoe before use.

Are Sidas insoles men's or women's sizes?

Sidas uses one size chart for everyone, based on foot length.

Shop Sidas and Get Fitted

Not sure about your size? Call us at (250) 331-6917 or come try them on at A-442 Duncan Ave, Courtenay; it's always best to get fitted at your local running store.

Size data from Sidas' official size guide (sidas.com) as of October 26, 2026.