What Is the Arch of the Foot?
The arch of the foot is the curved structure formed by the bones, ligaments, and tendons that run along the underside of your foot. Far from being a simple anatomical feature, the arch acts as a sophisticated shock-absorbing system — compressing under load to absorb impact and springing back to propel you forward with each step.
Most people have one of three arch types: low (flat), neutral, or high. Each has different support needs, and understanding your arch type is the first step to choosing the right footwear and orthotics.
The Three Arch Types
Low Arch (Flat Feet)
A low arch — or flat foot — means the arch has little to no curve, causing the entire sole to make contact with the ground. Low arches tend to cause the foot to roll inward (overpronate) during walking and running. This can lead to foot pain, shin splints, knee pain, and lower back discomfort over time. People with flat feet benefit most from firm, structured arch support that lifts and maintains the arch.
Neutral Arch
A neutral arch is considered the biomechanically ideal foot shape. The arch provides a natural balance between shock absorption and stability, and the foot tends to pronate to a healthy degree. People with neutral arches have the most flexibility in their choice of footwear and insoles, though they still benefit from supportive insoles to maintain alignment and reduce fatigue.
High Arch
A high arch means the foot has an exaggerated curve, with only the heel and ball of the foot making significant contact with the ground. High arches tend to cause the foot to roll outward (supinate or underpronate), concentrating pressure on the outer edge of the foot. This can lead to ankle instability, stress fractures, and pain in the ball of the foot. People with high arches need cushioning and flexible support rather than rigid motion control.
How to Identify Your Arch Type
A simple way to check your arch type at home is the wet foot test: wet the sole of your foot and step onto a piece of paper or a flat surface. Then examine the footprint:
- Flat foot — You'll see almost the entire sole of your foot, with little to no curve on the inner edge.
- Neutral arch — You'll see a distinct curve on the inner edge, with roughly half the arch area visible.
- High arch — You'll see a very narrow band connecting the heel and ball of the foot, with a large gap in the middle.
For a more accurate assessment, a professional foot scan — like those offered in Aetrex partner stores — analyses your arch type, pressure distribution, and gait in detail.
Why Arch Support Matters
Without adequate arch support, the structures of the foot — particularly the plantar fascia and the tendons — are placed under excessive strain. Over time, this leads to inflammation, pain, and injury. Proper arch support:
- Distributes body weight evenly across the foot
- Reduces strain on the plantar fascia, Achilles tendon, and calf muscles
- Improves alignment from the foot up through the ankle, knee, hip, and lower back
- Reduces fatigue during prolonged standing, walking, or running
- Helps prevent common conditions like plantar fasciitis, shin splints, and bunions
Types of Arch Support
Built-in Shoe Support
Many shoes — particularly running shoes and walking shoes — include some degree of arch support built into the midsole. However, this support is often generic and may not match your specific arch type or foot shape. It also degrades over time as the midsole compresses.
Over-the-Counter Insoles
Quality over-the-counter insoles offer a significant upgrade over standard shoe insoles. They come in different profiles for low, neutral, and high arches, and can be moved between shoes. Modern insoles from brands like Aetrex use advanced materials and 3D-printing technology to deliver a level of support and customisation that rivals custom orthotics.
Custom Orthotics
Custom orthotics are prescribed by a podiatrist and moulded to the exact contours of your foot. They're the most precise form of arch support and are recommended for severe biomechanical issues or complex foot conditions. They're also the most expensive option, typically costing several hundred euros.
Arch Support and Everyday Life
Arch support isn't just for athletes or people with foot problems. Anyone who spends significant time on their feet — whether at work, walking the city, or doing the school run — can benefit from proper support. The effects of poor arch support are cumulative: years of inadequate support can lead to chronic pain that's much harder to treat than if it had been addressed early.
The good news is that investing in the right arch support is straightforward and affordable. Whether you opt for supportive footwear, quality insoles, or a combination of both, your feet — and your whole body — will feel the difference.