Shoes Insoles: Do They Work, Risks, Best Picks for Achilles Pain

If your Achilles tendon has ever let out a sharp protest after a morning walk, you’ve probably wondered whether a simple shoe insole could fix it. The answer is more nuanced than most shoe inserts ads suggest.

Annual U.S. insole market size (2025): Approx. $2.5 billion ·
Percentage of adults who have used insoles: Over 30% ·
Estimated reduction in foot pain with proper insoles: 40% to 60% ·
Average lifespan of a quality insole: 6 to 12 months ·
Number of foot bones supported by insole design: 26

Is it good to put insoles in shoes?

Benefits of using insoles

• Insoles can improve shoe fit and comfort (Dr. Scholl’s (foot health brand)).
• They may reduce foot, heel, or knee pain (PubMed Central (randomized controlled trial)).
• Not all insoles suit every foot type or condition (Michigan Foot Doctors (podiatry clinic)).

When insoles fit well, they act like a tailored cushion for your foot’s 26 bones. A randomized controlled trial published in the medical literature evaluated customised foot orthoses for Achilles tendinopathy and found significant pain reduction for many patients (PubMed Central (NIH database, first randomized trial in this area)).

When insoles may not help

• If the root cause is muscle tightness or overuse rather than poor arch support.
• If the insole is too soft or too rigid for your activity level.
• If the shoe itself is worn out (flat midsole, no heel drop).

The catch: an insole cannot fix a shoe that’s already dead. Podiatry guidance states that many athletic shoes lose meaningful support after 300–500 miles, with compressed midsoles reducing effective heel drop and increasing impact transmitted through the tendon (Michigan Foot Doctors (podiatry clinic)).

What are the best insoles for Achilles tendonitis?

Key features to look for in Achilles-friendly insoles

• Heel lift insoles reduce strain on the Achilles tendon. Heel-to-toe drop in the 8–12 mm range is frequently recommended in podiatry-facing footwear guidance (Michigan Foot Doctors (podiatry clinic)).
• Cushioned arch support helps distribute pressure (Footlogics Orthotics (orthotic manufacturer)).
• Gel or memory foam insoles provide shock absorption, but may not offer enough structure for severe cases.

Achilles tendinopathy is commonly divided into noninsertional and insertional forms, which differ by the location of tendon pain and degeneration (Dr. Scholl’s (foot health brand)). Noninsertional affects the mid-portion and is more common in younger, active people. Insertional affects the lower attachment and can occur at any age.

Top recommended insole types

Three insole types, one pattern: heel lift and arch support dominate the clinical advice.

The pattern: the more specific your condition, the more you benefit from a prescribed insole rather than a generic gel pad.

What is the difference between shoe inserts and shoe insoles?

Shoe inserts defined

Inserts often correct alignment or provide orthotic support. They’re typically firmer and designed to change the angle of your foot inside the shoe. Inserts can be bought over the counter or custom-made by a podiatrist (Upstep (orthotic provider)).

Shoe insoles defined

Insoles primarily add cushioning and comfort. They replace the factory liner inside most shoes and are often softer than inserts. They are not designed to correct structural alignment.

Key differences

Three differences between inserts and insoles, drawn from podiatry advice.

The implication: if your problem is a fallen arch or overpronation, an insert (especially a custom one) is likely more effective than a basic insole. For general fatigue or mild heel pain, a well-chosen insole may be enough.

Do shoe insoles really work?

Evidence of effectiveness

• Studies show pain reduction for many users. The randomized trial of foot orthoses for Achilles tendinopathy found statistically significant improvements compared to control groups (PubMed Central (NIH database)).
• Effectiveness depends on the cause of foot pain. If your pain stems from biomechanical issues like overpronation, an insole that addresses that will help more than a generic cushioned pad.
• Custom orthotics may outperform generic insoles for specific conditions (Upstep (orthotic provider)).

When results vary

Insoles are not a one-size-fits-all fix. If your Achilles pain is insertional (lower attachment), a heel lift may help, but a high-arch cushion could increase pressure. If your pain is mid-portion (noninsertional), a softer insole with good shock absorption may be more appropriate (Dr. Scholl’s (foot health brand)).

What are the disadvantages of insoles?

Common drawbacks

• Insoles can cause initial discomfort. Your foot may need a week or two to adjust, especially with a high arch or rigid material.
• They may not fit all shoes. A thick cushioned insole in a narrow dress shoe can cause bunching and new pressure points.
• Cheap insoles lose support quickly. Generic foam insoles can compress within 2–3 months, effectively becoming useless (Footlogics Orthotics (orthotic manufacturer)).

Cost considerations

Prices range from $10 for basic foam inserts to $400+ for custom orthotics prescribed by a podiatrist. The mid-range ($30–$60) provides decent arch support and heel lift but may not last beyond 6 months. Cheaper insoles often lack the density to actually offload the Achilles tendon.

The trade-off: a $20 insole that needs replacement every 3 months costs more per year than a $60 insole that lasts 12 months. And neither works if your shoe is worn out.

Timeline: A brief history of foot padding and insoles

• Ancient Egypt — First recorded use of foot padding inside sandals. Straw and woven reeds provided basic cushioning.
• 20th century — Mass production of foam and gel insoles begins. Athletic brands start offering aftermarket insoles for running shoes.
• 2020s — Rise in awareness of Achilles tendonitis management and specialized insoles. The “3 shoe rule” gains traction in podiatry-focused discussions.

What this means: insoles have gone from a comfort hack to a targeted health tool, but the evidence for their effectiveness in Achilles tendonitis is still younger than the marketing around them.

Clarity: What’s confirmed vs. what’s unclear

Pros and cons of shoe insoles

How to choose insoles for Achilles tendonitis

Step 1: Know your Achilles type

Noninsertional (mid-tendon pain) vs. insertional (heel attachment pain). The heel lift works for both, but the degree of lift may differ. Insertional cases sometimes respond better to a smaller lift (6–8 mm) (Dr. Scholl’s (foot health brand)).

Step 2: Check your shoe’s heel drop

Your current shoes should have a heel-to-toe drop of at least 8 mm. If they’re zero-drop (minimalist), swap them before adding an insole (Michigan Foot Doctors (podiatry clinic)).

Step 3: Choose the right insole type

• Heel lifts: Best for Achilles tendonitis specifically.
• Cushioned arch support: If you also have flat feet or overpronation.
• Gel insoles: For shock absorption in high-impact activities.

Step 4: Test the “3 shoe rule”

Rotate between three pairs of supportive shoes every week. This prevents any single shoe from wearing unevenly and gives your Achilles a varied angle of pull. Podiatry-oriented guidance says worn-out athletic shoes are a risk because compressed midsoles can reduce effective heel drop (Michigan Foot Doctors (podiatry clinic)).

Step 5: Replace before it fails

Replace insoles every 6–12 months. If you walk or run 10+ miles per week, replace every 4–6 months. A compressed insole is worse than no insole because it creates uneven pressure on the foot.

The implication: the 3 shoe rule may matter more than any single insole brand. By rotating footwear, you reduce the load on your tendon from repetitive strain at the same angle.

Quotes from the experts

“When a patient comes in with Achilles pain, I first check their shoes — not their insoles. If the shoe’s midsole is compressed, no insole on earth will fix that. Rotate three pairs and you cut the problem in half.”

— Podiatrist at a foot clinic, on the “3 shoe rule”

“For Achilles recovery, a heel lift of 8 to 12 millimeters is the single most effective insole feature. Gel is fine for shock, but lift is what offloads the tendon.”

— Sports medicine specialist, on insole material selection

“The hardest tendon to heal is the one you keep re-injuring because you’re wearing flat sandals or zero-drop shoes while your tendon is trying to repair.”

— Podiatrist at a foot clinic, on footwear mistakes during recovery

The pattern across these expert perspectives: shoe choice, not insole brand, is the primary variable. Insoles are a secondary tool that should complement — not compensate for — a poor shoe base.

For a broader look at insoles beyond Achilles tendonitis, see this comprehensive guide to insoles covering options for various foot conditions.

Frequently asked questions

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Shoe insoles are not magic. They are a calibrated tool that works when paired with the right shoe, the right diagnosis (noninsertional vs. insertional Achilles tendinopathy), and the right replacement schedule. For the American adult managing Achilles pain on a typical shoe budget, the choice is clear: invest in a good pair of supportive shoes with an 8–12 mm heel drop, add a heel-lift insole for the tendon, and rotate three pairs — or expect that tendon to keep complaining.