Three sizes, two foams, six pairs — but only two things to decide, and they go in this order. Size depends on your toes. Firmness depends on where you are, and for almost everyone the first pair is Soft. Both steps are on this page, and the six pairs are underneath.
Shoe size gets you close. What actually has to fit is the width and thickness of your toes, so the three sizes below are shown at the same camera distance — the difference you see is the real difference. Drag any of them to look at the slots. Soft and Firm share the same shape in each size — only the foam differs — so decide your size here, then choose your foam in step two below.
Small
Women's US 4.5–7
Men's US below 7*
Medium
Women's US 7–9.5
Men's US 7–8.5
Large
Women's US 9.5–12
Men's US 8.5–14
One model per size is all you need to compare — the shape is the same in Soft and Firm. Tap the AR icon on any model to place it on your floor at real size.
Start from your everyday shoe size
Not your sport shoe. Cleats, climbing shoes, pointe shoes and racing flats are fitted tight on purpose, usually a half to a full size under what your foot measures. They tell you nothing about what this has to fit. Use the shoes you walk around in — or better, measure your bare foot.
| Toe-Rx size | Women's US | Men's US |
|---|---|---|
| Small | 4.5 – 7 | below 7 * |
| Medium | 7 – 9.5 | 7 – 8.5 |
| Large | 9.5 – 12 | 8.5 – 14 |
* The maker's chart gives no men's range for Small. If your men's US size is below 7, you are in Small territory — but at that size, measure your bare foot rather than trusting a conversion.
If you land on a boundary, or your toes aren't average
Shoe size measures length. What has to fit here is width and thickness.
The one check that is actually to scale
On an iPhone or iPad, tap the AR icon on any model above to place a full-size Toe-Rx on your floor. Hold your bare foot beside it. The closer the AR image sits to the floor, the more accurate the size. The screen can only show relative size; AR shows the real thing at the real size, and it is the closest you can get to trying one on before it arrives.
On Android, the same icon opens Scene Viewer. The product pages below carry the same models.
Wrong size? Sizing from a shoe size is an estimate, not a guarantee. If yours pinches or slips, get in touch and we will exchange it for the size that fits. Please do that rather than adapting to it — wearing the wrong size is uncomfortable and can cause injury.
Size decided? Step two: Soft or Firm ↓
The foam. Soft opens your toes less far and gives you less to close against; Firm does both harder. That is the entire difference — so the question is not which is better, but which one your feet are ready for this month.
The one to learn on.
A gentler spread and less resistance in the closing move. We recommend it first to everyone — not because feet are fragile, but because the movement is unfamiliar and the first week is where people push too hard. Most people are ready to move up in a few weeks; some are happy to stay.
The one to move up to.
A wider opening and more to close against. The right second pair for most people, and the right first pair for some — the list of who is just below. Same price, so moving up is a decision about your feet, not your budget.
Shape, slot layout, three sizes, $39.95, made in Japan, usable in water.
How wide it opens your toes, and how much it pushes back when you close them.
What it does. Both are for the same ten minutes; Firm is not "more effective", it is more resistance.
Firm is a fine first pair if…
Start with Soft if…
Whichever you choose: ten minutes, sitting down, bare feet, every other day. The routine is the same on both foams — only the resistance changes. The six pairs are just below.
