Nike Air Zoom Pegasus 37 Sizing Guide: Run Small? (95 Pairs)

Nike Air Zoom Pegasus 37 Sizing — What 95 Pairs in the Feetlot Database Tell Us

The Nike Air Zoom Pegasus 37 is a daily road-running silhouette tracked across 95 owner-reported pairs in the Feetlot database. The fit pattern across those owners is consistent: residual variation sits around 0.20 to 0.25 size units, in line with the population-wide norm Feetlot sees for normal sneakers. The takeaway is steady — the Pegasus 37 runs about half a size small, so most wearers add a half size rather than buying their nominal number.

The reason is built into the shoe. As a performance running shoe, the Pegasus 37 has a snugger, more wrapped fit than a lifestyle sneaker, and runners generally want a thumb's width of room at the toe to avoid jamming the front on toe-off. The engineered mesh upper holds the midfoot close and the toe box is on the trim side, which pushes the typical wearer up half a size — it is about length and running fit, not just width.

Should You Size Up or Down in Nike Air Zoom Pegasus 37?

Standard fit (most people)

Go half a size up from your true Nike size. The Pegasus 37's wrapped running fit and trim toe box make a true-to-size pair feel short once the foot swells and slides forward over a run. Half a size up gives the toes room on toe-off while the laces still cinch the engineered mesh down over the instep for a secure hold.

Wide feet

Go half a size up, and look for the wide (2E) width if it is offered. The standard Pegasus 37 is a medium-to-narrow last, and the mesh upper is supportive rather than stretchy, so wide feet at true size feel pinched across the forefoot. The extra half size opens up the toe box; the wide width fixes the girth without adding more length than you need.

Narrow feet

Stay true to size, or go up half if you want toe room for running. Narrow feet are the one group that can get away with the nominal Nike number, since the close midfoot that troubles other wearers actually suits a narrow foot. The laces close the mesh down tightly enough to lock a narrow foot in at true size for walking and casual wear.

Pegasus 37 standard vs Shield and FlyEase makeups

The Pegasus 37 came in a weatherized Shield version and a hands-free FlyEase version alongside the standard build. The length sizing is the same across makeups — half a size up for most — but the Shield's slightly thicker upper can feel a touch snugger out of the box, and the FlyEase entry system changes how the heel locks in rather than the length you buy.

How Nike Air Zoom Pegasus 37 Compares to Other Sneakers

The Pegasus 37 sits close in length to most lifestyle sneakers once you account for its half-size-small running fit. According to Feetlot data, the Pegasus 37 fits at essentially the same numerical size as the Air Jordan 1, Vans Authentic, adidas YEEZY Boost 350 V2, Nike Air Max 90, Nike Blazer Mid '77, Air Jordan 4, Nike SB Dunk Low, and Nike Air Max 97. If a wearer takes size 10 in any of those, they take size 10 in the Pegasus 37 too.

The notable exceptions are the roomier-fitting models. According to Feetlot data, the Nike Air Force 1, Converse Chuck Taylor, and adidas Superstar all run about half a size bigger-fitting than the Pegasus 37 — so you buy a half size smaller number in those than in the Pegasus 37, or read the other way, expect to add half a size when moving from one of those to the Pegasus 37. The boot-style Clarks Desert Boot runs a full size bigger-fitting, so go a full size down from your Pegasus 37 number when buying it.

Sign in to Feetlot and add a few of your other sneakers to get a personalized Pegasus 37 size recommendation calibrated to your actual foot rather than to the population average.

Nike Air Zoom Pegasus 37 Size Chart (US / EU / UK)

Common Sizing Mistakes

• Buying your true Nike size out of habit. The Pegasus 37 runs about half a size small. Treating it like a true-to-size lifestyle sneaker leaves the toes hitting the front on a run — add the half size.
• Ignoring the trim forefoot if you have wide feet. The medium-to-narrow last is the most-cited fit complaint. Wide feet should size up half and look for the 2E width; the mesh upper supports rather than stretches.
• Applying Air Force 1 sizing. The AF1 runs roomy and most owners size it down half. The Pegasus 37 is the opposite — it runs small, so size up. Do not carry the AF1 rule over.
• Sizing up a full size for length. Half a size up is the fix for the snug running fit. A full size leaves the heel loose and lets the foot slide forward over the Zoom Air unit, which causes blisters and lost energy return.
• Buying small expecting the mesh to give. The engineered mesh softens a little over the first runs but the last does not lengthen. A too-short Pegasus 37 stays too short.

How Feetlot Computes These Numbers

Every Nike Air Zoom Pegasus 37 sizing recommendation on Feetlot is the output of a global offset model fit to over 100,000 owner-reported shoe records. Each shoe gets a single number — its "size offset" — that captures how much its sizing drifts from the reference shoe (the Nike Air Force 1). When a Feetlot user provides their size in any tracked sneaker, the model recovers their true foot baseline and recommends the matching Pegasus 37 size.

This works better than the more common pairwise approach because Feetlot uses the entire wardrobe graph. A YEEZY 350 owner contributes data about how YEEZY fits relative to AF1 owners, which links to Pegasus 37 owners through shared wardrobes. Even when two users own zero shoes in common, the users in between transmit a consistent answer.