Do You Need Custom Orthotics, or Will Ready-Made Flat Foot Insoles Do?
For many people with flat feet, ready-made arch support insoles give enough comfort for everyday use. Custom orthotics become worthwhile when ready-made insoles have not helped. They are also worthwhile when a podiatrist finds a structural issue, such as significant overpronation, that needs precise correction. A standing whole-body assessment can show whether the problem starts at the foot or higher up the chain.
Key takeaways
- Ready-made insoles for flat feet work well for mild discomfort and general arch support.
- Custom orthotics are shaped to your foot. They can address specific structural problems that a generic insole cannot.
- Foot pain sometimes comes from misalignment at the knee, hip or pelvis, not the foot alone.
- A weight-bearing image of the whole body can show whether custom orthotics will target the real cause.
- Getting the right information first can save you spending money on orthotics you may not need.
What is the difference between custom orthotics and ready-made insoles?
Ready-made insoles are pre-made arch support insoles. They are designed to fit a range of foot shapes. You choose a size and slip them into your shoes. They cushion or support your arch straight away. They suit many people with mild flat feet or general foot tiredness.
Custom orthotics, sometimes called prescription orthotics, are made from a mould or 3D scan of your own foot. A podiatrist checks your gait, your arch height and the way your foot takes weight. They then design an orthotic shaped to correct your specific biomechanics. The device usually includes features like a heel post or targeted pronation control that a generic insole does not offer.
Custom orthotics cost considerably more than ready-made options. That spending makes sense when your foot mechanics truly need it. For many people, though, a well-chosen pair of ready-made insoles does the job perfectly well.
How do you know if ready-made insoles are not enough?
A ready-made insole stops being enough when your symptoms persist even though you wear good arch support insoles regularly. Here are the common signs that you may need a more tailored approach.
Pain that comes back day after day, even with insoles in place, suggests the support does not match your foot.
If the sole of one shoe wears down much faster on the inner edge, your foot may be rolling inwards more than the insole can control.
Pain above the foot can be a sign that a foot alignment issue is affecting the whole chain. Read more about knock knees and lower limb load.
If you have tried several brands of ready-made orthotic insoles without improvement, the issue likely needs an individual assessment.
Are custom orthotics worth it compared to ready-made insoles?
Custom orthotics are worth the investment when there is a clear structural reason for them, confirmed by a professional assessment. Without that confirmation, you could spend a lot of money on a device that addresses the wrong problem.
Best for: mild flat feet, general comfort, standing for long periods at work, or as a first step before investing more.
How they work: a pre-formed arch shape spreads plantar pressure across the foot. Good options use firm foam or semi-rigid material rather than soft gel alone.
Limitations: they cannot correct significant overpronation or fit unusual arch shapes. One size does not fit every foot.
Best for: persistent symptoms that have not improved with ready-made insoles, confirmed structural issues like severe flat foot or rigid high arches, and specific gait abnormalities found by a podiatrist.
How they work: cast or 3D-scanned to your foot, often with a heel post or wedge to correct specific angles. The prescription is based on your own biomechanics. Learn more about orthotics for overpronation.
Limitations: higher cost, a longer process, and they only solve the problem if the foot is truly where the issue starts.
Here is the key question most people miss. Your pain may actually be caused by a pelvic tilt, a hip alignment issue or an imbalance further up the body. If so, even the most perfectly shaped custom orthotic will not fix the root cause. The foot may be compensating for a problem above it.
How does standing imaging help you choose between insoles and custom orthotics?
A standing, weight-bearing image captures your skeleton under real load, from your feet to your head, in the upright position your body works in every day. This matters because lying-down imaging (standard X-ray, CT, MRI) relaxes the muscles. It can hide alignment problems that only appear when you are upright and gravity is acting on your joints.
Your body is a connected chain. A flat foot can roll the ankle inward, which tilts the knee, which shifts the pelvis, which curves the spine. Pain often shows up far away from its true cause. ScanAlign standing imaging captures this entire chain in a single low-dose scan, using about 90% less radiation than a standard X-ray, around ten times less.
With this full picture, you and your podiatrist can see exactly where the misalignment starts. You can also see whether custom orthotics will target the right level. Without it, you might correct the foot while the real driver sits at the hip.
Want to find out what is really driving your foot or leg pain before you spend on orthotics?
Book a free video consultationWhen should you try ready-made insoles, and when should you go custom?
The decision is simpler than it seems. Start with what your symptoms and history tell you.
- Mild flat feet with occasional aching
- Foot tiredness from standing or walking
- No pain above the ankle
- You have not tried good-quality arch support insoles yet
- Persistent pain even with insoles
- Significant overpronation found by a professional
- Knee, hip or back pain along with flat feet
- A past injury affecting foot mechanics
- Several pairs of insoles tried without relief
A note on soft tissue. EOS standing imaging shows bones, joints and alignment beautifully. For soft tissue problems like plantar fascia tears, tendon damage or nerve issues, MRI is usually the better tool. Your clinician can advise which is right for you.
Before you start a treatment, or change the one you are on, it is worth getting a detailed diagnosis. Knowing whether the cause sits in the pelvis, the legs or the spine changes what will actually help.
If you are a podiatrist or physiotherapist and would like to refer a patient for standing alignment imaging before prescribing orthotics, see our information for referring podiatrists.
Frequently asked questions about flat foot insoles and custom orthotics
They can be, but only when a professional has confirmed a structural problem that ready-made insoles cannot address. If your flat feet cause only mild discomfort, good-quality ready-made arch support insoles are a sensible first step.
Most good-quality insoles last around six to twelve months with daily wear. Replace them when the arch support feels compressed or the material has worn thin under the heel.
Sometimes. If flat feet are causing the knee to rotate inward, correcting foot position can reduce load on the knee. However, knee pain can also come from alignment issues at the hip or pelvis, so it is worth checking the whole chain.
No referral is needed. ScanAlign is a private, self-pay clinic and you can book directly. If you have a podiatrist or doctor, they are welcome to refer you, but it is not a requirement.
Arch support lifts the arch to spread pressure. Pronation control goes further. It adds a structured heel post or wedge that limits how far the ankle rolls inward. Custom orthotics usually offer both, while most ready-made insoles give arch support only.
Yes. The EOS system uses about 90% less radiation than a standard X-ray, around ten times less. You stand naturally inside the machine and the scan takes only a few seconds.
The price for patients travelling from abroad is confirmed during the free video consultation, which has no obligation.
Most custom orthotics fit into lace-up shoes and joggers with a removable insole. Very flat or narrow shoes may not have enough room. Your podiatrist will advise on shoe fit when prescribing.
A standing alignment scan can help you and your clinician understand whether custom orthotics will address the true source of your problem. It is particularly useful if you have pain in the knee, hip or back as well as the foot.
When you lie down, gravity is removed and your muscles relax. Alignment shifts that cause pain under the load of standing and walking simply disappear on a lying-down image. A standing scan captures the skeleton under real load, showing the true picture.
Not sure what your feet really need?
A free video consultation with our specialist radiographer can help you understand whether a standing alignment scan would add useful information before you spend on orthotics.
Book a free video consultationWritten by Abbas Dhami (Specialist Diagnostic Radiographer)
Sources
- NHS. "Flat feet." nhs.uk. Accessed 2025.
- Banwell HA, Mackintosh S, Thewlis D. "Foot orthoses for adults with flexible pes planus: a systematic review." Journal of Foot and Ankle Research, 2014;7:23.
- The College of Podiatry. "Foot orthoses: guidance for patients." cop.org.uk. Accessed 2025.
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.