SIZE GUIDE
Find Your Perfect Fit.
MustWing insoles are trim-to-fit — choose your range, trim along the guide lines, and enjoy a custom fit in seconds.
Trim-to-Fit — One Insole, Every Shoe.
Every MustWing insole covers a range of sizes and has printed trim lines on the back. Pick your size range, then trim with scissors for a perfect fit. Works with sneakers, boots, dress shoes, and more.
Size Chart
Find your range using your US, EU, or UK shoe size.
| MustWing Size | US Men's | US Women's | EU | UK | Foot Length |
|---|---|---|---|---|---|
| S | 5 – 6 | 6.5 – 7.5 | 35 – 36 | 4 – 5 | 22.5 – 24 cm |
| M | 7 – 8 | 8 – 9.5 | 37 – 38 | 6 – 7 | 24.5 – 26 cm |
| L Popular | 8.5 – 9.5 | 10 – 11 | 39 – 42 | 7.5 – 8.5 | 26.5 – 28 cm |
| XL | 10 – 11 | 11.5 – 12 | 43 – 44 | 9 – 10 | 28.5 – 29.5 cm |
| XXL | 11.5 – 13 | — | 45 – 47 | 10.5 – 12 | 30 – 31.5 cm |
How to Trim for a Perfect Fit
Three steps. Under 60 seconds. No tools required — just scissors.
Remove Your Old Insole
Take out the existing insole from your shoe. This is your template — place the MustWing insole on top of it.
Trace & Trim
Align the heel edges, then use a pen to trace along the toe area of your old insole. Cut along the line with sharp scissors.
Place & Walk
Drop the trimmed MustWing insole into your shoe — textured side up. The acupressure nodes activate with every step. You'll feel the difference immediately.
Works With Your Shoes
MustWing insoles fit most shoe types. Here's what works best.
Sneakers
✅ Perfect FitWork Boots
✅ Perfect FitRunning Shoes
✅ Perfect FitDress Shoes
👍 Good FitTrim carefully for narrower fit
Sandals
⚠️ LimitedOnly closed-back sandals
Heels
⚠️ LimitedLow heels only (under 2 inches)
Not Sure About Your Size?
Measure your foot in 60 seconds.
Place a piece of paper on a hard floor against a wall.
Stand on the paper with your heel touching the wall.
Mark the tip of your longest toe with a pen.
Measure from the edge of the paper to the mark in centimeters. Match it to the "Foot Length" column above.
Common Questions
What if I order the wrong size?
No worries — our 30-day money-back guarantee covers sizing issues. If the insole doesn't fit after trimming, contact us and we'll send the right size or give you a full refund.
Can I trim MustWing insoles to fit any shoe?
Yes. Every MustWing insole has printed trim lines on the bottom. Use sharp scissors to cut along the line matching your shoe size. The insole fits US sizes 4 through 14.
Do they work with wide feet?
MustWing insoles are designed to fit standard to wide-width shoes. The flexible EVA foam naturally adapts to your foot shape. For extra-wide shoes, go one size up for more coverage.
Should I remove my existing insole first?
Yes — always remove the factory insole before inserting MustWing. Stacking insoles reduces the fit and the effectiveness of the acupressure nodes.
Will they make my shoes feel tight?
MustWing insoles are the same thickness as most factory insoles (4–6mm at the toe, 8–10mm at the heel). Since you're replacing — not adding — an insole, your shoe fit stays the same.
Ready to Feel the Difference?
Free shipping · 30-day money-back guarantee · Trim-to-fit any shoe
Shop MustWing →