Shoe Width and Insoles
How shoe width and insole selection work together — why getting the width right comes first, how insoles affect fit, and which insoles work best for wide, narrow, and therapeutic feet.
Shoe width and insoles are two separate dimensions of shoe fit — but they interact directly. Adding an insole to a shoe changes how the width feels. Buying a wide shoe to accommodate an insole changes which insole will work. Getting one wrong undermines the other.
Most guides treat shoe width and insoles as separate topics. This page covers how they work together — so you can make both decisions correctly the first time.
The most important principle in this guide: get the correct shoe width before choosing an insole. An insole cannot fix a shoe that is the wrong width. Adding arch support to a too-narrow shoe makes it tighter. Adding volume-filling insoles to a too-wide shoe helps, but only partially. Measure your foot width first — see our How to Measure Foot Width guide — then use this page to choose the right insole for your correctly-fitting shoe.
How Insoles Affect Shoe Width
Every insole adds material inside the shoe. That material occupies space — it reduces the internal volume of the shoe, which affects how the shoe fits both in width and in height above the foot.
Insoles make shoes feel narrower
A standard full-length insole typically adds 3–6mm of material thickness. This material sits under the foot and presses the foot upward slightly, which also presses the foot outward against the sides of the shoe. The effect is roughly equivalent to moving half a width narrower — a shoe that felt like a comfortable D width without an insole may feel like a snug C with one. This is why people who add insoles to correctly-fitting shoes sometimes report them feeling suddenly tight — the insole, not the shoe, is causing the compression.
What this means for wide-footed buyers
If you have wide feet and plan to use an insole, buy your shoe one width wider than your measured foot width, then add the insole. If your measured width is 2E, buy 2E and add the insole — not E with an insole. The insole will bring the fit snugger, but you’ll still be in the correct width range. Buying E and adding an insole puts you back in a shoe that’s too narrow.
What this means for narrow-footed buyers
Narrow-footed buyers can use insoles strategically to fill excess volume in a standard-width shoe when a narrow-width version isn’t available. A medium-thickness full-length insole in a standard B width shoe can bring the fit closer to what an AA or A width would feel like — not perfect, but significantly better than the standard width without any insole. See the narrow feet section below for specific recommendations.
Insole depth and shoe design
Some shoes are designed to accommodate insoles with extra depth — the removable factory insole can be taken out and replaced with a custom or aftermarket insole without reducing the width. Look for shoes described as “extra depth,” “orthotics-friendly,” or “removable insole.” These are particularly common in walking, orthopedic, and therapeutic footwear. New Balance, Brooks, and most therapeutic brands build with this in mind. Fashion shoes and many athletic shoes are not designed for insole replacement and will feel crowded when a full-length insole is added on top of the existing footbed.
Insoles for Wide Feet
Wide-footed people often also have flat arches — the two tend to go together because a fallen arch causes the foot to spread outward. If you have wide, flat feet, the right insole addresses both the arch and the metatarsal area simultaneously.
What to look for:
A wide-feet insole should have firm arch support to prevent further arch collapse and foot spreading, a deep heel cup to stabilize the rear of the foot, and a metatarsal pad or raised metatarsal dome to support the ball of the foot and reduce pressure across the wide part of the foot. The insole should be low-profile enough that it doesn’t add excessive volume — a high-volume insole in an already correctly-fitting wide shoe can make it tight.
Key considerations by condition:
Wide feet with flat arches: Prioritize firm arch support. The arch support prevents the foot from continuing to spread under load, which both maintains your current width and reduces the fatigue that comes from an unsupported flat arch. Semi-rigid or rigid arch support — not soft cushioning — is the right choice here. Soft foam arch support compresses quickly and provides little actual support under the load of a wide, flat foot.
Wide feet with ball-of-foot pain: A metatarsal pad placed just behind the ball of the foot spreads the metatarsal heads apart, relieving the compression that causes pain in this area. This is particularly useful for wide-footed people with Morton’s neuroma or metatarsalgia. The pad should sit just proximal to (behind) the ball of the foot — not under it.
Wide feet with heel pain (plantar fasciitis): A deep heel cup combined with firm arch support is the right combination. The heel cup stabilizes the heel and reduces the stress on the plantar fascia insertion point. Gel heel cups alone without arch support are insufficient for wide, flat-footed people with plantar fasciitis — the arch needs to be supported to reduce the tension on the fascia through its full length.
If you’re buying insoles for wide feet, look for insoles that come in wide widths themselves. Standard-width insoles trimmed down to fit a wide shoe create a gap at the sides where the insole doesn’t contact the shoe. Wide-specific insoles — available from brands like Superfeet, Powerstep, and Sof Sole — are built wider to fill the full base of a wide shoe without trimming.
Insoles for Narrow Feet
For narrow-footed buyers, insoles serve a different primary purpose — filling excess volume to bring a standard-width shoe closer to the fit of a narrow-width shoe. The insole here is compensating for a width problem, not primarily providing support.
What works:
A medium-thickness full-length insole reduces the internal volume of the shoe and pushes the foot slightly outward against the sides — which actually helps narrow-footed buyers by bringing the shoe walls closer to the foot. Combined with a heel grip, this approach can transform a standard-width shoe that was floppy and loose into something that fits acceptably well for a narrow foot.
What doesn’t work:
Very thick insoles (6mm+) in narrow shoes. If you’re already in the correct narrow width, adding a thick insole makes it too tight. The goal is to use the insole as a volume filler in a standard-width shoe, not to add it on top of an already snug narrow shoe. Thin insoles (3mm or less) are generally appropriate for narrow shoes.
Combination approach for narrow high-arched feet:
Narrow-footed people often also have high arches, and high-arched feet need different support than flat feet. A high-arched foot needs cushioning and a moderately supportive arch profile — not a rigid corrective arch insert, which would push against an already high arch and cause discomfort. Look for cushioned insoles with a neutral to low arch profile for narrow, high-arched feet.
Insoles for Therapeutic and Diabetic Feet
For people with diabetes, neuropathy, edema, or post-surgical foot conditions, the insole choice is a medical decision as much as a comfort decision. The wrong insole in a therapeutic context can cause pressure ulcers, skin breakdown, or injury that a person with reduced sensation may not feel until serious damage has occurred.
Diabetic insoles — what matters:
Diabetic insoles prioritize pressure distribution over arch correction. The goal is to eliminate pressure hotspots across the entire bottom of the foot — particularly under the metatarsal heads and heel — rather than to correct biomechanics. Materials that conform to the foot’s exact shape are preferable to rigid corrective supports for diabetic feet. Look for insoles specifically labeled for diabetic use, as these are designed with pressure distribution as the primary engineering goal.
Extra-depth shoes and insoles:
People with significant foot conditions — bunions, hammertoes, custom orthotics, or edema — typically need extra-depth shoes rather than just a wider width. Extra-depth shoes add vertical space above the foot in addition to width, allowing custom orthotics and thick diabetic insoles to fit without compressing the top of the foot or the toes. Therapeutic brands like OrthoFeet, Propet, and Apex build extra depth into most of their designs specifically for this reason.
Custom orthotics and shoe width:
Custom orthotics prescribed by a podiatrist require even more internal shoe volume than aftermarket insoles. If you have custom orthotics, always buy shoes one width wider than your measured foot width — and ideally choose extra-depth styles. Remove the factory insole entirely when inserting custom orthotics. Trying to wear custom orthotics in a standard-depth, correctly-fitting shoe almost always results in a shoe that is too tight with the orthotic in.
If you have diabetes and are experiencing foot pain, numbness, tingling, or any skin changes on your feet, see a podiatrist before selecting insoles or therapeutic footwear independently. Diabetic foot complications are serious and the right footwear prescription depends on your specific condition. Medicare covers therapeutic footwear and inserts for qualifying diabetic patients — your podiatrist can help you access this benefit.
Insoles by Shoe Width — Quick Reference
| Situation | Insole Approach | What to Look For |
|---|---|---|
| Wide feet, flat arch | Firm arch support + metatarsal support | Semi-rigid arch, deep heel cup, low profile — buy shoe one width up |
| Wide feet, ball-of-foot pain | Metatarsal pad behind ball of foot | Metatarsal dome or pad, cushioned forefoot |
| Wide feet, heel pain | Deep heel cup + arch support | Rigid or semi-rigid arch + deep heel cup together |
| Narrow feet in standard shoe | Volume filler + heel grip | Medium-thickness full-length insole, heel grip separately |
| Narrow feet, high arch | Cushioned neutral arch | Cushioning first, low arch profile, thin overall |
| Custom orthotics | Extra-depth shoe + remove factory insole | Buy one width wider, extra-depth design, remove OEM insole |
| Diabetic feet | Pressure-distributing diabetic insole | Diabetic-specific, pressure distribution primary goal — consult podiatrist |
Which Shoe Brands Work Best with Insoles
Not all shoes accommodate insoles equally well. The brands and models that work best are those built with extra depth and a removable factory insole.
New Balance is the best mainstream brand for insole use. Many of their walking and running models — particularly the 1540 series — are built with significant extra depth and a removable insole specifically to accommodate custom orthotics and aftermarket insoles. Wide widths (2E, 4E) give the additional lateral room needed when an insole is added.
Brooks and Saucony both build walking and running shoes with good insole depth. The Addiction Walker and similar comfort-focused models from Brooks are particularly accommodating.
Hoka shoes have significant volume by design — their high-stack cushioning platform means even adding a moderately thick insole doesn’t create tightness in most styles.
OrthoFeet, Propet, and Apex are specifically engineered for insole and orthotic use. All three offer extra-depth designs as standard, and their therapeutic widths (up to 6E) provide the room needed for custom orthotics without compression.
Nike and Adidas are generally poor choices for insole users. Their shoes are built with minimal depth and a thin, non-removable sockliner — adding a full-length insole on top of the existing footbed quickly creates tightness, especially in the toe box.
For a complete breakdown of brand fit characteristics, see our Shoe Brand Width Guide.
For More on Insoles and Pain Relief
This guide covers the relationship between shoe width and insole selection. For deeper coverage of insole types, materials, conditions, and specific product guidance — including insoles for plantar fasciitis, heel pain, knee pain, and diabetic foot care — visit our sister resource:
Detailed guides on every major insole category, condition-specific recommendations, and how to choose the right insole for your specific foot and pain issue. Visit PainReliefInsoles.com →
Start with Your Width
Before choosing an insole, make sure you’re in the correct shoe width. A three-minute measurement eliminates the most common shoe-fitting mistake.
How to Measure → Wide Feet Guide →Frequently Asked Questions
Yes — if you plan to use a full-length insole, buy your shoe one width wider than your measured foot width. The insole occupies internal volume and effectively makes the shoe feel half to one full width narrower. If you buy the exact width you measured and add a full-length insole, the shoe will likely feel too tight. If you’re using a thin half-length insole (heel and arch only), you may not need to go up a width — but for full-length insoles 4mm or thicker, the extra width is important.
Partially — insoles can reduce the internal volume of a too-wide shoe and bring the fit closer to correct, but they are a workaround rather than a true fix. A full-length insole in a shoe that is one full width too wide will significantly improve the fit. A shoe that is two or more widths too wide will remain unstable and loose even with an insole. The correct answer is always the right width shoe — insoles are useful when the exact narrow width isn’t available, not as a replacement for proper width selection.
Usually yes — especially if the aftermarket insole is full-length and more than 3–4mm thick. Stacking an aftermarket insole on top of the factory insole adds too much volume in most shoes and creates tightness across the top of the foot and in the toe box. The exception is shoes specifically designed for insole use — extra-depth shoes where the factory insole is a thin placeholder meant to be replaced. In these shoes, removing the factory insole and inserting the aftermarket one gives you the correct fit.
Wide, flat feet need semi-rigid arch support — not soft cushioning. Soft foam insoles compress quickly under the load of a flat, wide foot and provide little actual arch correction. Look for insoles with a firm plastic or carbon fiber shell under the arch, a deep heel cup, and enough width to fill the base of a wide shoe without trimming. The insole should be available in a wide width — standard-width insoles leave gaps at the sides of a wide shoe. For detailed insole recommendations by condition, visit PainReliefInsoles.com.
Yes, with care. Children with flat arches and wide feet can benefit from supportive insoles — but the insole should be chosen carefully. Children’s feet are still developing, and aggressive corrective arch supports are generally not recommended for young children without a podiatrist’s recommendation. A moderate arch support that guides the foot without forcibly repositioning it is appropriate for most children. Always buy the child’s shoe one width wider than their measured width if you plan to add an insole, for the same reason as adults — the insole will take up internal volume.