Climbing Shoe Heel Fit: Why "Narrow Heel" Isn't Enough

Climbing Shoe Heel Fit: Why "Narrow Heel" Isn't Enough. Narrow heel or shallow heel? The same "empty heel" may have two completely different causes - and different shoes fix each one.

Why heel fit is hard to predict

Heel fit is key to climbing shoe performance, especially for hard boulders where a better fit, and hence less slip on aggressive heel hooks, makes a big difference. Yet, it's incredibly hard to pick the right heel from today's available online descriptions. Climbing shoes get often described with single words like "narrow" or "low-volume" on both the forefoot and the heel side, and this is simply insufficient. Two climbers with the same heel width can have a very different fit in the same shoe. This article breaks down heel width and heel depth using data from our first 200 foot scans.

Heel width vs. heel depth: two independent dimensions

Sizing guides often treat the heel as a single dimension: narrow, normal, or wide. That's simply not enough. Our scanner explicitly captures two photos, sole and side, to measure two independent heel dimensions.

Heel width ratio captures how wide your heel is relative to your foot length. Our scans range from 0.20 (very narrow) to 0.28 (wide). The average sits around 0.24.

Heel depth ratio captures the vertical profile of your heel, essentially how much it projects backward from your ankle. This ranges from 0.01 to 0.12, with the average around 0.035. A shallow heel (under 0.03) and a deep heel (over 0.05) need fundamentally different cup shapes.

These two numbers are surprisingly independent. You can have a narrow heel with deep projection, or a wide heel that's shallow. They produce very different fit problems, and shoes respond to them differently.

A sample to showcase narrow heel vs. shallow heel

Here are two real scans from our dataset. Both climbers reported an empty heel in at least one popular shoe. The underlying mismatch is the opposite in each case.

Scan A - Narrow heel width with average depth

Egyptian toes, street size EU 45.5. Heel width ratio 0.216, heel depth ratio 0.047. Reported fits: Scarpa Drago EU 44 empty, Scarpa Instinct VSR EU 44 empty, La Sportiva Ondra Comp EU 43 empty, Scarpa Instinct VSR LV EU 44 perfect, Mad Rock D2.ONE HV EU 46 perfect.

Heel width is well below the population average whilst depth is slightly above average. The three empty heels are all shoes whose cups are too wide for this climber. The low-volume Instinct VSR LV and the high-volume D2.ONE HV with its rather narrow heel cup both grip, the standard-fit heels don't. The problem here is clearly width, not depth.

Scan B - Shallow heel depth with average width

Egyptian toes, street size EU 42.5. Heel width ratio 0.251, heel depth ratio 0.024. Reported fits: La Sportiva Skwama EU 39.5 empty, La Sportiva TC Pro EU 41 empty, Evolv Shaman EU 42.5 empty, Tenaya Mastia EU 39.5 perfect.

Heel width is around the population average (climber 0.251 vs population 0.238), while heel depth is clearly below (0.024 vs 0.034). Three shoes report empty heels and only the Tenaya Mastia, which uses a pre-shaped and rather firm heel cup, locks in. Going narrower on width wouldn't help any of the empty-heel shoes; this is a depth problem. A narrower heel would likely even worsen the situation, resulting in empty space at the back AND bottom of the heel as the foot wouldn't fit into the narrow profile.

Same written complaint, "empty heel", but two different mechanisms. If you treated both climbers as "narrow-heeled" and pointed them at low-volume lasts, you'd help Scan A and make Scan B worse.

There is a wrinkle on the Scan B side. The one shoe that gripped was the Tenaya Mastia, whose heel cup is pre-shaped from a firm, thermo-molded rubber shell, meaning the cup holds its own form. The La Sportiva Solution uses the same idea: a firm, bulbous molded cup reinforced by P3 randing. Both of our other shallow-heel scans who wear the Solution (heel depth 0.021 and 0.024) also report perfect heel fit. Three out of three shallow heels in firm pre-formed cups landing on "perfect" is a small sample, but it is a consistent one, we'll keep watching it.

• Foot scans: 201 (as of 2026-04-13)
• Fit observations: 280 across 97 shoes
• Shoes with ≥10 reports: 4 - first patterns visible

Which climbing shoes fit which heel shapes? (Data from 280 reports)

When someone scans their feet, they also tell us what shoes they currently climb in and how those shoes fit: toes, forefoot, and heel, each rated as squeezed/tight, perfect, or loose/empty. That lets us match real fit outcomes against measured foot geometry. Patterns for every shoe in the dataset with more than 10 fit reports:

Scarpa Instinct VSR (13 reports)

77% empty heels. Empty-heel users average heel width 0.231 (narrow) with normal depth (0.036). The two users reporting a perfect heel have slightly wider heels (0.239) and notably deeper projection (0.053). Both dimensions seem to matter.

La Sportiva Skwama (10 reports)

90% empty heels. Eight of the nine empty-heel users have normal-to-wide heel width (avg 0.245), they're not narrow-heeled. What unites them is shallow depth (avg 0.027). Worth noting: the Skwama also uses a 3D molded heel cup, but a notably softer one than the Mastia or Solution. Its reinforcement (La Sportiva's "S-Heel") is a stiffener on the sides of the cup, not a firm backwards shell. So "3D molded" alone doesn't guarantee a shallow heel will grip - cup firmness likely matters too.

Scarpa Drago (11 reports)

55% perfect, 36% empty. Empty-heel users average heel width 0.225, perfect-heel users 0.251 with quite mixed heel depth. Apparently forgiving on depth, but not a good fit for narrow heels.

Evolv Shaman (10 reports)

A textbook depth split. Heel width is nearly identical between perfect-fit (0.245) and empty-fit (0.246) users. Depth tells the whole story: perfect users average 0.072, empty users 0.031. A 2.3× difference. If your heel projects deeply, the Shaman's aggressive rand tension grips it. If it doesn't, you float.

A new shape emerging? Mad Rock D2.ONE HV

An interesting counterpoint is emerging in the Mad Rock D2.ONE HV (8 reports so far): 7 perfect heels, 1 tight, zero empty. It's marketed as a high-volume shoe yet has a rather narrow heel cup. The first shoe in our dataset where "empty heel" essentially doesn't show up. We'll watch it closely as the sample grows.

Recommendations for narrow heels

You can mostly rely on the manufacturer data: shoes advertised with a narrow overall and/or narrow heel fit should work well. If you have a wider forefoot but a rather narrow heel, we'd recommend looking into the Mad Rock Drone series HV models (the Drone 2.0 HV, the D2.ONE HV, and the Drone CS HV) and some Evolv models such as the V6 and Zenist Pro.

Recommendations for shallow heels

This is where it gets trickier. In most online sources, including manufacturer data, heel depth is not clearly distinguished from heel width. From the current scan data, one viable path might be a firm, molded cup that potentially leaves some dead space but preserves its shape even when not fully filled by the heel, such as the La Sportiva Solution and the Tenaya Mastia. Alternatively you can visually inspect the shoe's construction and heel form: is it a rather flat back, or does it bulge significantly below the tensioning rand? We will update this article as soon as we have more data.

How we implement two-dimensional heel scoring

This is what makes heel fit hard. The same "empty heel" complaint has completely different causes depending on the shoe and foot, but standard manufacturer descriptions often rely on a single generic fit aspect. Treating "heel" as one variable misses the mechanism.

Hence, our scorer uses two dimensions. When it evaluates whether a shoe's heel cup will work for you, it weights heel width and heel depth separately, calibrated by what we've learned from each shoe's fit pattern. We're also starting to tag shoes by heel-cup construction - firm pre-formed cups (Solution, Mastia) versus soft/thin cups with side reinforcement (Skwama) - because the same shallow-heel foot gets opposite outcomes depending on which type it meets. Moving forward we also want to introduce a proper 3D modelled heel to identify additional patterns and improve the quality of our recommendations.

Still early, getting sharper

We have performed 200 scans so far, enough to see first patterns for the four most popular models, but for many shoes we still only have too few data points. Incoming scans are growing rapidly and every scan that includes a current shoe fit adds to our recommendation engine. The model doesn't guess: it uses deterministic scoring and gets more precise as the dataset grows.

The goal isn't to replace trying shoes on. It's to narrow the field from 400+ shoes to the dozen that match your geometry, before you spend money on shipping or drive to a shop that might not stock what you need.

Frequently Asked Questions

Why does my climbing shoe heel feel empty?

An empty heel almost always comes down to one of two independent mismatches between your foot and the shoe's heel cup: heel width (how wide your heel is relative to your foot length) or heel depth (how far your heel projects backward from your ankle). A single adjective like "narrow heel" hides which one is actually wrong. In the climbing-gear.com foot-scan dataset (April 2026), the Scarpa Instinct VSR, La Sportiva Skwama, Scarpa Drago and Evolv Shaman each fail for different reasons.

Which climbing shoes fit narrow heels?

Based on climbing-gear.com foot-scan data, the best bets for narrow heels (heel width ratio under ~0.23) are the Scarpa Instinct VSR LV and the Mad Rock D2.ONE HV. The Instinct VSR LV is specifically narrowed through the heel; the D2.ONE HV is unusual in pairing a high-volume last with a rather narrow heel cup. Standard-width cups from Scarpa Drago, Scarpa Instinct VSR, and La Sportiva Ondra Comp often leave narrow heels empty.

Which climbing shoes fit shallow heels?

Shoes with firm, pre-shaped heel cups work best for shallow heels (heel depth ratio under ~0.03). In our dataset, the Tenaya Mastia and La Sportiva Solution both lock shallow heels in because their molded rubber shells hold their own form, rather than relying on rand tension to pull flat rubber tight. Shoes that consistently fail on shallow heels include the La Sportiva Skwama (90% empty), Evolv Shaman, and La Sportiva TC Pro.

Does the Scarpa Instinct VSR fit narrow heels?

Not reliably. Across 13 reports, the Scarpa Instinct VSR produced empty heels in 77% of cases, concentrated on climbers with heel width below 0.23 and normal-to-shallow depth. The low-volume Scarpa Instinct VSR LV is a much better choice for narrow heels.

Does the La Sportiva Skwama fit shallow heels?

No. Across 10 reports, the Skwama produced empty heels in 90% of cases, and the pattern is clearly shallow depth rather than narrow width. The Skwama's "S-Heel" reinforcement is a side stiffener, not a firm rear shell, so a shallow heel can't generate enough rearward pressure to fill the cup.

What's the difference between a narrow heel and a shallow heel?

Heel width is how wide your heel is relative to foot length (population average ~0.24). Heel depth is how far your heel projects backward from your ankle (population average ~0.034). They're largely independent: you can have a narrow heel with deep projection, or a wide heel that's shallow. Each needs a different cup shape, which is why single-adjective descriptions like "narrow heel" aren't enough.

Try it yourself: climbing-gear.com/scan.

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