Walk into any chemist and you'll find a wall of gel insoles promising instant comfort. Search online and you'll find clinician-grade EVA orthotics claiming to fix your foot pain. They look similar, they go in your shoe, and they both claim to help — but they work in fundamentally different ways. Here's the clinical difference.
How gel insoles work
Gel insoles are made from soft, flexible silicone or thermoplastic gel. They work by cushioning — absorbing impact forces as your foot strikes the ground. They don't change how your foot moves or correct biomechanical issues. Think of them like a soft mattress: comfortable, but not supportive.
Gel insoles are useful for mild discomfort from standing on hard floors, thin-soled shoes, or general foot fatigue. They're not effective for structural conditions like plantar fasciitis, flat feet, or overpronation, because they don't address the underlying cause — they just make the symptom temporarily more comfortable.
How EVA orthotics work
EVA (ethylene-vinyl acetate) orthotics are semi-rigid or firm devices with engineered arch support, heel cups, and biomechanical correction features. They work by controlling how your foot moves — supporting the arch, stabilising the heel, correcting pronation, and redistributing pressure across the sole. They address the mechanical cause of foot pain, not just the sensation.
Quality EVA orthotics like Trekker orthotics are designed with specific clinical features — an inverting heel cup, medial skive, and navicular support — that a flat gel insole simply doesn't have. Formthotics use Formax™ foam (a proprietary EVA variant) that can be heat-moulded for a semi-custom fit.
When to use gel insoles
- Mild foot fatigue from standing on hard surfaces
- Thin-soled dress shoes or heels where you need extra cushioning
- General comfort improvement in shoes that don't accommodate a thicker orthotic
- Temporary relief while waiting for proper orthotics
Products like Walker's Gel Plantar Fasciitis Sleeves and Silipos WonderCup Heel Cups are quality gel products designed for specific conditions — but they work best alongside structural support from EVA orthotics, not instead of it.
When to use EVA orthotics
- Plantar fasciitis — the arch support and heel cup directly offload the plantar fascia
- Flat feet and overpronation — controls the collapse of the arch during gait
- Heel pain — the deep heel cup stabilises and cushions the heel
- Achilles tendinopathy — combined with a heel raise, reduces tendon loading
- Knee, hip, or lower back pain caused by poor foot biomechanics
- Any condition where the underlying problem is HOW the foot moves, not just HOW it feels
Can I use both?
Yes — and it's a common clinical approach. An EVA orthotic provides the structural correction inside the shoe, while a gel sleeve or gel heel cup worn on the foot adds targeted cushioning at the point of pain. For example, a Trekker orthotic for arch support with a Walker's Gel PF Sleeve for heel cushioning is a combination many podiatrists recommend for plantar fasciitis.
The bottom line
- Pain from standing on hard floors, want more cushion → gel insoles
- Pain from how your foot moves, want correction → EVA orthotics
- Diagnosed condition (plantar fasciitis, flat feet, overpronation) → EVA orthotics
- Maximum relief → both together