How to Trim Insoles to Fit Your Shoes Correctly

Trim-to-fit insoles are designed to work across a range of shoe sizes, but getting a clean, comfortable fit takes a few careful steps. Here's how to do it right.

Step 1: Remove your shoe's existing insole

If your shoe has a removable factory insole, take it out first. You'll use it as your sizing template in the next step.

Step 2: Use the old insole as a guide

Place your existing insole on top of the new one, lining up the heel ends exactly. Trace around the front edge with a pen or marker.

Step 3: If there's no old insole, use your shoe directly

Set the new insole into the shoe, heel pressed firmly into the back. Note where the toe area extends past the shoe's edge.

Step 4: Cut slightly inside your line

Cut a little inside the marked line rather than exactly on it. You can always trim more, but you can't add material back if you cut too much.

Step 5: Test the fit before wearing all day

Put the trimmed insole in the shoe and walk around the house for a few minutes. Check that your toes aren't cramped and that the heel sits flat without shifting.

A few tips

• Use sharp scissors for a clean edge — dull scissors can tear the material.
• Trim in small increments around the toe area, since that's the part most likely to need adjusting.
• Keep the heel cup shape intact; that's where most of the shock absorption and support work happens.

FlexRipple Massage Insoles are trim-to-fit by design, so they can be adjusted for sneakers, work shoes, and most boots using the steps above. For shoe-specific advice, see our guide on insoles for work boots, sneakers, and everyday shoes.