Room to move your toes.
Your toes and the top of your foot should have space. The insole should lie flat, without curling or buckling.
Size & shoe fit
Start with
your shoe size.
Choose the US size in the shoes you’ll use. The same chart applies to all five models.
No arch-height test needed.
Your size, at a glance.
Use the size printed inside your usual pair of shoes.
Your PerseveranX size
Choose aboveYour matching size will appear here.
This matches our size chart. Your shoe’s shape and internal space still matter.
One chart.
All five feels.
Pick the size first. Your cushioning preference won’t change the size range.
| Insole size | US men | US women | Insole length |
|---|---|---|---|
| XS | 4.5–6.5 | 5.5–7.5 | 9.92 in 25.2 cm |
| S | 7–8.5 | 8–9.5 | 10.63 in 27.0 cm |
| M | 9–10.5 | 10–11.5 | 11.22 in 28.5 cm |
| L | 11–12.5 | 12–13.5 | 11.81 in 30.0 cm |
| XL | 12.5–14.5 | 13.5–15.5 | 12.40 in 31.5 cm |
Between L and XL? US men’s 12.5 and women’s 13.5 appear in both ranges. Compare the lengths with your removable insole before choosing.
Length is a reference. These are untrimmed insole lengths, not foot measurements. Width, arch position and room inside the shoe also affect fit.
When you want to double-check
Let your old insole
be the guide.
Take out the original insole if it’s designed to come out. Place it flat and measure the longest heel-to-toe distance.
Compare that measurement with the chart, then compare the outlines with the heels aligned. Don’t use the length of your bare foot.
Back to the chartA size match is the start
Keep the support.
Leave room for you.
Your new pair replaces the removable insoles in your shoes. Lace up with your usual socks and check these three things.
Support in the right place.
The raised area should meet your arch comfortably. A sharp pressure point means the fit needs another look.
A heel that sits securely.
Your heel should sit in the cup, with enough shoe around it. It shouldn’t be pushed up out of the shoe.
My shoes already feel snug.
Check the room above your foot and around your toes after replacing the original insole. Cutting the front shorter won’t fix a shoe that lacks depth or an arch that presses in the wrong place. Keep the heel and support frame intact.
My original liner is glued or sewn in.
Leave it in place. Don’t force it out or assume there is room to stack another insole on top. Ask us about your shoe before choosing.
Only if needed
Trim the front.
Keep the foundation.
Use the original insole’s forefoot outline as your guide. Take off a little, then check again.
Line up the heels.
Lay the original removable insole over the new one. Align the heels, then compare the forefoot outlines.
Trim a little at the front.
Follow the original forefoot outline with small cuts. Leave the heel, raised arch and support frame intact.
Put it back. Check again.
It should lie flat in the shoe. Try it with your usual socks and check toe room, arch contact and heel position before cutting more.
Still deciding
on the fit?
These are the details worth knowing before you choose.
Do I need to know whether my arch is high or low?
No arch-height label is needed to choose between our five models. They share a raised support profile, with different cushioning feels. Match your shoe size, then check where the support meets your foot. No single shape fits every foot equally.
Does 0.16 in mean they’ll fit any shoe?
No. Approximately 0.16 in (4 mm) is the cushioning layer alone. The shaped middle layer, frame and cover add to the profile. Check the room in your actual shoe, especially above your foot and around your heel.
See the three layersMy size isn’t in the chart. Should I size up?
Don’t choose a larger size solely to cut it down. That can change where the arch and heel sit beneath your foot. Contact us with your usual shoe size and shoe model so we can help you assess the options.
What if I wear different sizes in different shoes?
Start with the size in the shoes you plan to use most. If you move the insoles to another pair, check again: internal length, width and depth can differ even when the printed sizes match.
What if the support feels too high?
Check that the heel is seated and the contour meets your arch in the right place. Don’t cut the support frame or try to force a painful fit. If the pressure remains uncomfortable, contact us about the fit or use the return process.
Can I return them after wearing or trimming?
Yes. Request a return within 30 days of delivery, including worn or trimmed pairs. Email perseveranx@gmail.com with your order number and wait for the prepaid label and instructions before sending them back. To change size or model, return the original pair and place a new order.
Read the full return policy30 days.
Try your pair in your own shoes.
Worn or trimmed pairs are included.