Nike Air Relentless 2 Sizing: Run Big or Small?

Nike Air Relentless 2 Sizing, What the Feetlot Database Tells Us

The Nike Air Relentless 2 is a budget-friendly running and gym trainer built on a narrow, performance-oriented last. Across 31 verified pairs in the Feetlot database, the fit pattern is consistent: this shoe runs a little tighter than the Nike Air Force 1, Feetlot's reference shoe. The gap is modest, roughly a quarter size, but it is enough that anyone used to the roomy Air Force 1 toe box should expect a closer, more locked-in feel here. For most wearers that lands on true to size, with the snugness being the reason wide feet should plan to go up.

Should You Size Up or Down in Nike Air Relentless 2?

Standard fit (most people)

Stay true to your usual Nike size. The Air Relentless 2 is a running silhouette, so it is meant to hold the foot firmly with minimal slip at the heel. A true-to-size pick gives the secure, athletic fit the shoe was designed for. Because it runs slightly small versus the Air Force 1, do not size down expecting the same generous room, you will end up cramped through the toes.

Wide feet

Go half a size up. The Air Relentless 2 uses a fairly narrow midfoot and a tapered toe box, and the mesh-and-overlay upper does not stretch much widthwise. Half a size up buys the extra width without the length getting sloppy, which is the most reliable fix for wide feet in a narrow running last.

Narrow feet

Stay true to size. Narrow feet are well served by this last as-is, the snug build wraps the foot without needing a size down. Lace lock-down at the top eyelets handles any remaining heel slip better than dropping a half size would.

In-between sizes

Round up. With a running shoe this close-fitting, the half size up is far more forgiving than the half size down, especially for longer wear, gym sessions, or feet that swell during activity. Going down leaves no margin once the foot warms up.

How Nike Air Relentless 2 Compares to Other Shoes

According to Feetlot data, the Air Relentless 2 fits about the same length as the Vans Authentic, owners who have both tend to take the same size in each. It runs a touch smaller than the Converse Chuck Taylor All Star, so wearers generally take a slightly larger number in the Air Relentless 2 than in their Chucks.

Against dress and heritage footwear, the gap widens. Feetlot owners of both tend to take a noticeably larger number in the Air Relentless 2 than in the Clarks Desert Boot or the Wolverine 1000 Mile, those boots run large, so the running shoe feels smaller by comparison. The same directional pattern holds against the Red Wing Iron Ranger and the Onitsuka Tiger Ultimate 81, where wearers step up roughly half a size or more from those models to land in the right Air Relentless 2. Within Nike's own lineup, it sizes close to the Air Max Challenge, running about half a size smaller.

Sign in to Feetlot and add a few of the shoes already owned to get a personal Nike Air Relentless 2 size recommendation calibrated to a real foot.

Nike Air Relentless 2 Size Chart (US / UK / EU)

Common Sizing Mistakes

• Sizing down to copy the Air Force 1. The Air Relentless 2 already runs slightly small versus the AF1, dropping a half size leaves the toes cramped.
• Ignoring width. This is a narrow running last. Wide feet need the half size up, not a forced squeeze into true to size.
• Buying small expecting the mesh to give. The upper holds its shape; it does not stretch out to add real length.
• Forgetting foot swell. For gym and running use, feet swell during activity, round in-between sizes up, not down.

How Feetlot Computes These Numbers

Every Nike Air Relentless 2 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 Air Relentless 2 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.