New Balance 373 Sizing: Run Big or Small?

New Balance 373 Sizing, What the Feetlot Database Tells Us

The New Balance 373 is the affordable retro lifestyle runner in the lineup, and Feetlot data shows a steady, predictable fit. Across the verified pairs in the Feetlot database, the 373 sits just slightly on the small side of the Nike Air Force 1, Feetlot's reference shoe, which in practice means most wearers take their normal size and are happy. There is no dramatic up-or-down adjustment here: the headline is "true to size for most," with width doing the fine-tuning rather than length.

The clearest signal in the data is consistency. The 373 doesn't behave like a wild card; it lands close to the size people already expect from their everyday sneakers, leaning a hair snug rather than roomy.

Should You Size Up or Down in New Balance 373?

Standard fit (most people)

Stay true to size. According to Feetlot data, the 373 runs slightly small versus the Air Force 1, but the gap is small enough that the everyday wearer's normal size is the right call. Buy your usual size and the suede-and-mesh upper settles in over the first few wears.

Wide feet

Keep your length true to size and move up in width. The 373's upper is a touch narrow, so the better fix for a wide foot is New Balance's wider lasts, D or 2E, rather than buying a longer shoe. Sizing up in length to chase width leaves the heel sloppy and the toe swimming; widening the last solves the actual problem.

Narrow feet

Stay true to size in length and consider the narrow B width. Because the 373 already runs a touch narrow, many narrow-footed wearers get a secure fit at standard width, but the B last locks the midfoot down if standard feels loose. Length stays the same.

A note on width sizing

This is the part new New Balance buyers miss. New Balance length is true to size, but width is a separate dimension: B (narrow), D (standard), and 2E (wide) all share the same length and only change how the shoe wraps the foot. If a 373 feels short or long, change the number; if it feels tight or loose across the foot, change the letter.

How New Balance 373 Compares to Other Shoes

The 373 has fewer cross-comparison data points than a flagship sneaker, so Feetlot reads these directionally rather than to the decimal. The pattern is clear, though. According to Feetlot data, the 373 fits close to Vans Authentic and the Nike Roshe Run, owners of both tend to take the same size. Against Converse Chuck Taylor the 373 runs a touch smaller, so wearers tend to take a slightly larger number in the 373 than in their Chucks.

The bigger gaps show up against boots. Feetlot data points to the 373 running noticeably smaller than the Clarks Desert Boot, and clearly smaller than the Red Wing Iron Ranger, owners of both in the Feetlot database tend to take a larger number in the 373 than in those heavy leather boots, which is normal when comparing a slim sneaker last to a roomy welted boot. The takeaway: against sneakers, the 373 is roughly true to size; against chunky boots, expect to size up to match.

Sign in to Feetlot and add a few of the shoes already owned to get a personal New Balance 373 size recommendation calibrated to a real foot.

New Balance 373 Size Chart (US / UK / EU)

Common Sizing Mistakes

• Sizing up to get more width. The 373's narrowness is a width problem, not a length problem, move to D or 2E, not a longer shoe.
• Ignoring the width letter entirely. Most buyers grab the default D and never realize B and 2E exist in the same length. The letter is half the fit.
• Copying a boot size. The 373 runs smaller than Clarks and Red Wing boots, so a true sneaker size will land short if you match your boot number.
• Buying small expecting big stretch. The suede and mesh relax a little, but length and the slim last stay put, don't size down hoping it opens up.

How Feetlot Computes These Numbers

Every New Balance 373 sizing recommendation on Feetlot is the output of a global offset model fit to over 100,000 verified 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 shoe, the model recovers their true foot baseline and recommends the matching New Balance 373 size. This works better than a simple pairwise lookup because Feetlot uses the entire wardrobe graph: even when two users share no shoes directly, the chain of users between them transmits a consistent recommendation. That is why a shoe with a modest number of direct owners still gets a stable size estimate.