Hallux valgus turns up in 53% of long-time high-level climbers, against roughly 12% of adults generally. The reason is not a mystery: climbing shoes get worn two to four sizes down, for hours a week, and X-rays put the big toe angle at 14 degrees barefoot and 21 degrees inside the shoe. Toe-Rx opens your toes back out and gives them something to grip against, in the hours you are off the wall.
Schöffl V, Küpper T. Feet injuries in rock climbers. World Journal of Orthopedics, 2013. A review, not a trial; the 53% figure comes from a cohort of long-term high-level climbers, 20% of whom had it in both feet. See how we read the evidence
A climbing shoe works by holding your foot narrow and your toes curled. That is the point of it — and it is also why claw toes and a drifting big toe are the two most common chronic findings in climbers' feet. Toe-Rx runs both of those directions backwards, in the hours you are not wearing the shoe.
Toe-Rx sits between the toes and pushes the big toe back out, away from the second. That direction has a name — hallux abduction — and it is the exact movement your shoe spends its hours reversing.
It is also the movement at the centre of the conservative treatment trials for hallux valgus, where a toe separator is part of the protocol rather than an accessory to it.
With the toes held open, squeeze them closed against the silicone. The contraction loads the plantar intrinsic muscles, including the abductor hallucis that holds the big toe in line.
Toe grip strength was one of the measures trained and tracked in the year-long hallux valgus trial, alongside hallux abduction — the two halves of what Toe-Rx is built to do.
Someone tested this directly. Twenty-four people with hallux valgus wore an orthosis for eight weeks; half of them also did a toe-spread-out exercise. The orthosis-only group showed no significant change in anything measured. The group that added the movement improved significantly in all three measures — hallux valgus angle, angle during active abduction, and the size of the abductor hallucis muscle.
A separate trial in 2026 pointed the same way from the other side: six weeks of foot strengthening reduced the hallux valgus angle in both the group wearing a silicone spacer and the group without one. The spacer added nothing on top of the exercise.
So we are not going to tell you that wearing something between your toes fixes a foot. Toe-Rx opens the toes far enough to train them, and gives them something to close against. The movement is the part that counts.
Kim MH, Yi CH, Weon JH, Cynn HS, Jung DY, Kwon OY. Effect of toe-spread-out exercise on hallux valgus angle and cross-sectional area of abductor hallucis muscle in subjects with hallux valgus. Journal of Physical Therapy Science, 2015;27(4):1019–1022. · Effects of foot strengthening exercises with or without a toe spacer on hallux alignment, foot mobility, and balance: a randomized controlled trial. Applied Sciences, 2026;16:3163.The research on climbers' feet is good at describing the damage and almost silent on what to do about it. We are going to show you both halves of that, including the trial we would most like to cite and cannot, because nobody has run it.
Schöffl and Küpper collected what was known about the climbing foot. Among long-term high-level climbers, 53% had hallux valgus and 20% had it in both feet. Alongside it they catalogue pressure marks, subungual haematoma, dystrophic nails, claw toes and hallux rigidus.
For scale, pooled prevalence of hallux valgus in adults aged 20 to 60 in the general population is around 12%. A separate study of sport climbers found the number of years spent climbing was related to chronic foot injury, while chronological age was not — which points at accumulated exposure rather than getting older.
Where it stops This is a review of observational work, not a trial. It establishes that climbers' feet look like this and that tight footwear travels with it. It does not show that anything you do off the wall changes the outcome. The paper is also from 2013; shoe design has moved since.
Read the reviewThis was the first study to put a number on how far climbers downsize. The mean reduction was almost four UK shoe sizes for climbing footwear. The authors also found climbers' everyday shoes were smaller than their ideal fit — the habit does not stop at the crag. Foot pain during climbing was reported by 91.07%.
Radiographs elsewhere put the hallux valgus angle at 14 degrees barefoot and 21 degrees once the climbing shoe is on.
Where it stops Self-reported survey data from one sample, and the authors are explicit that there is insufficient evidence about the extent or the harms of the practice. Reported foot pain is not the same as diagnosed injury. Downsizing travels with deformity here; that is not the same as proving it causes it.
Read the studyResearchers imaged climbers' feet inside their shoes twice: standing still, then engaged on a climbing wall built inside the scanner. The big toe angle itself did not change between the two. What did change was everything around it — the first intermetatarsal angle went from 9.9 to 11.6 degrees, and the interphalangeal angle from 15.3 to 18.7 degrees.
Their conclusion was that climbing shoes force excessive angulation through the joints, and more so under load than at rest.
Where it stops Twenty-four recreational climbers at a single site, imaged once. This measures joint position in the moment; it does not follow anyone over time, and it cannot tell you whether those angles become permanent. The authors say directly that more research is needed.
Read the studyAbdalbary randomised 56 women with moderate hallux valgus to either 36 sessions over three months or a waiting list. The treatment was joint mobilisation, strengthening for hallux plantarflexion and abduction, toe grip strength work, ankle dorsiflexion stretching, and a toe separator. Pain and AOFAS scores were better at the one-year follow-up.
This is the closest thing to direct evidence for what Toe-Rx does. The two movements it trains — opening the big toe outward, and gripping — are both inside that protocol.
Where it stops Not climbers. All women, all with hallux valgus already established, so this is treatment rather than prevention. The control group was a waiting list rather than a sham, which inflates apparent effects. And because it was one bundled programme across 36 supervised sessions, nobody can say how much of the result came from the separator.
Read the study (doi: 10.7547/17-026)Kim and colleagues split 24 people with hallux valgus into two groups for eight weeks. Both wore an orthosis. Only one group also performed a toe-spread-out exercise — actively pulling the big toe away from the second.
The orthosis-only group showed no significant change in any of the three measures taken. The group that also did the exercise improved significantly in all three: a smaller hallux valgus angle, a smaller angle during active abduction, and a larger abductor hallucis muscle. The difference between the two groups was significant as well.
This is the study behind everything else on this page. Wearing something between your toes, on its own, did nothing over two months. The movement is what moved the numbers.
Where it stops Twenty-four people, none of them climbers, all with hallux valgus already established. Both groups wore an orthosis throughout, so this shows what adding the exercise did — not what the exercise achieves on its own. And the orthosis used was not Toe-Rx.
Read the study (doi: 10.1589/jpts.27.1019)Nobody has taken a group of climbers, given half of them toe strengthening work, and followed both groups to see whose feet held up. Runners have that study. Climbers do not.
So everything above is borrowed. The prevalence work tells us climbers' feet get damaged and points at the shoes. The treatment trials tell us that opening and gripping the toes helps feet that already have hallux valgus — in women who were not climbing. Joining those two ends together is reasonable. It is not proof, and we are not going to dress it up as one.
What would change our mind A controlled trial in climbers, measuring hallux valgus angle and foot pain over a season or more, with a real control group. If one gets published and it goes against us, we will put it on this page.
That Toe-Rx makes you a better climber. We looked for research connecting toe strength to climbing grade or performance and did not find any. The literature in this sport documents what footwear does to feet, not what training feet does to climbing. Anyone promising you a grade from a foot product is ahead of the evidence.
That it prevents deformity. Every trial we have cited treated feet that already had hallux valgus. Prevention has not been tested — in climbers or in anyone else.
That it beats sizing up. The exposure is the shoe: four sizes down, hours a week, angles rising under load. Ten minutes with a piece of foam does not out-argue that, and we would rather tell you so than sell around it.
We sell a foot product, so read this with that in mind. It is still true. If you want your feet to last, the first thing to look at is not us — it is what you put them in and for how long.
Ten hours a week in the shoes. Seventy minutes a week with us.
Where those numbers come from High-level climbers in one study averaged around ten hours a week in shoes roughly two sizes down; a larger survey put the mean reduction closer to four UK sizes. Ten minutes a day with Toe-Rx comes to about seventy minutes a week. Time is not a perfect stand-in for effect — but the imbalance is big enough that pretending otherwise would be dishonest.
The cheapest change available, and probably the largest. Weight-bearing CT imaging found the joints bend furthest not when you are standing in the shoes, but when you are loaded on the wall — so the minutes sitting at the base of a route in laced-up shoes are pure cost with no benefit attached.
Basis Imaging study of 24 climbers showing greater joint angulation under load. Nobody has trialled taking shoes off as an intervention — this follows from the exposure data rather than from a study of the habit itself.The survey that measured downsizing found something climbers rarely expect: participants' everyday footwear was also smaller than their ideal fit. If you climb ten hours a week and spend fifty in shoes half a size too short, the second number is doing more damage than the first.
Basis Measured foot and shoe lengths in a cross-sectional survey of active climbers. Costs you nothing in performance.Aggressive downturned shoes exist for a reason and we are not going to tell you to stop projecting in them. But warm-ups, gym laps, belaying and easy mileage do not need the same shoe. Severity of deformity tracks with the gap between your foot size and your shoe size, so the fix is to shrink that gap on the days it costs you nothing.
Basis Hallux valgus severity was associated with climbing duration and with the difference between foot size and climbing shoe size. There is a real trade-off on small footholds and only you can decide where it sits.Young climbers grow through shoe sizes fast, and the damage that short footwear does to a developing foot is documented outside climbing as well as inside it. Check the fit far more often than feels necessary.
Basis Community study linking increased hallux angle in children to insufficient footwear length, plus the finding in climbers that years of exposure — not age — tracked with chronic foot injury.After all of that. Toe-Rx does not shorten the hours your foot spends folded, and nothing you do for ten minutes a day is going to out-argue ten hours a week. What it can do is give those hours something to work against — opening the big toe back out, and loading the muscles that hold it there.
If you have already sized up, already unlace between burns, and still want to do something for your feet on rest days, that is the honest place for a product like this. Not instead of the list above. After it.
You do not need a new routine. Do this after you unlace, and once more on a rest day. For most climbers that lands at three or four times a week, which is roughly the frequency used in the hallux valgus trials — 36 sessions over three months in one, 22 over six weeks in the other.
Nothing we have read says daily beats every other day. Pick the version you will still be doing in three months.
Spread and release
Work each toe fully into its slot and sit with them held open. No effort needed — let the foam do it. This is the direction your shoe spends its hours reversing. It is also the slowest part to tolerate at first, so go by feel rather than by the clock.
Circle the toes
With Toe-Rx still in, use your hand to rotate the tips of your toes in small controlled circles, ten in each direction. Takes the toe joints through a range they never see inside a climbing shoe.
Lift and grip
Still wearing it, lift your toes up, then press them down firmly into the floor, squeezing against the foam as they close. The working set. Toe grip strength was one of the things trained and measured in the year-long hallux valgus trial.
About ten minutes per foot, sitting down. Toe-Rx is waterproof, so the first two steps work in a bath or a foot soak after a session. Full instructions and photos
Straight after you take the shoes off
The exposure has just ended and your feet are already bare. If you only ever do it at one time of day, do it here.
On a rest day
Nothing to work around, and it matches how the training was delivered in the trials — as its own session rather than something bolted onto a workout.
Just before you put your climbing shoes on
Two reasons, and only one of them is research. Holding a stretch for 60 seconds or more has been shown to temporarily reduce maximal force, and the effect grows the longer you hold — a 3–5 minute spread is well past that line. That work was done on large muscle groups, not toes, so treat it as caution rather than proof. The practical reason is simpler: a foot you have just spread wide is not the foot you want to force into a shoe two sizes down.
The women in the hallux valgus trial got 36 supervised sessions over three months, and the programme included joint mobilisation by a therapist and ankle dorsiflexion stretching alongside the toe work. Ten minutes with Toe-Rx is not that.
What it covers is the part at the centre of it: opening the big toe outward, and gripping while it is open. If your feet already hurt, or the big toe has visibly drifted, this is worth taking to a podiatrist rather than a product page — ask about conservative management for hallux valgus by name.
Two decisions: how firm you want it, and what size fits your foot. Both matter more here than they would for most people. Climbers' toes tend to be stiffer and less willing to separate than average, and a Toe-Rx that hurts is one you will stop using.
Soft Start here if your toes are tight
A gentler spread. This is the one we would point most climbers to first — and that is not a soft-pedal, it is what the range is built for. If your toes do not separate much yet, or the big toe has already started to drift toward the second, begin here. You can move up later.
Firm
More resistance to grip against, and a wider opening. Right once your toes tolerate the Soft comfortably, or if you have come to climbing from a sport that left your feet in better shape than most climbers'. Both types cost the same, so this is not a question of spending more.
Do not use your climbing shoe size
It is the number you know best and it is the wrong one. Climbers downsize by two to four sizes, so ordering from it would put you several sizes too small — which is the exact compression this whole page is about. Use your street shoe size, or better, measure your bare foot.
| Toe-Rx size | Women's US | Men's US |
|---|---|---|
| Small | 4.5 – 7 | CONFIRM_BEFORE_PUBLISHING |
| Medium | 7 – 9.5 | 7 – 8.5 |
| Large | 9.5 – 12 | 8.5 – 14 |
On an iPhone or iPad, open any product page in Safari and tap the 3D image to place a full-size Toe-Rx on the floor in AR. Hold your bare foot next to it before you order — it is the closest thing to trying one on.
If you land on a boundary, or your toes aren't average
Shoe size measures length. What has to fit here is the width and thickness of your toes, and years of climbing will have changed both.
Women's 7 and 9.5, and men's 8.5, sit on the line between two sizes. If that is you, let your toe shape decide.
Sizing from a shoe size is an estimate, not a guarantee, and climbers' feet vary more than most. If your Toe-Rx pinches or slips once you try it, get in touch and we will exchange it for the size that fits.
Please do that rather than pushing through it. Wearing the wrong size is uncomfortable and can cause injury — and forcing your feet into something too small is the habit this page is asking you to break. Contact us about an exchange
Climbers' feet take a documented beating, and the shoes are why. Hallux valgus runs at 53% in long-time high-level climbers against roughly 12% of adults generally, and the angle of the big toe rises the moment the shoe goes on. The first fix is the shoe, not us.
After that: opening the big toe outward and gripping while it is open are the two movements inside the conservative treatment protocols for hallux valgus. That is what Toe-Rx is for. Ten minutes, on the days you already have.
Every figure on this page comes from one of these. Where a study's findings run out, we have said so in the section that cites it.
No study on this page tested Toe-Rx, and none of them studied climbers. The prevalence and imaging work describes what happens to climbers' feet. The treatment trials tested opening and gripping the toes in people who already had hallux valgus and were not climbing. We have joined those two ends together because we think it is reasonable, and we have said clearly where that reasoning starts.
Toe-Rx is not a medical device. Nothing here is intended to diagnose, treat, cure or prevent any condition. Hallux valgus is a diagnosable deformity with an established conservative-management pathway — if your big toe is painful or visibly drifting, that is worth a podiatrist, not a product page. If you have diabetes or reduced sensation in your feet, speak to a clinician before using anything that presses between your toes.
