Quick Answer
It depends. The Nike InfinityRN 4 is a good choice for slow, comfortable road runs, but it’s heavy and runs small. Its ReactX foam, stable platform, and durable outsole suit easy mileage. Independent testing measured 316 grams in a men’s sample. Buy it for comfort, not speed, and consider going half a size up.
Is the Nike InfinityRN 4 worth buying?
- Best for easy runs, recovery days, and daily walking.
- ReactX cushioning provides a soft, steady ride.
- Heavy construction and a warm upper limit versatility.
Best for Comfortable Easy Miles
Overall
Comfort
Value
Durability
Scores reflect Running Shoes Guru’s independent review, not testing by Footwearhiker.
Best for: Neutral runners who prefer cushioned, stable daily trainers.
Not ideal for: Fast workouts, hot-weather runs, or lightweight-shoe fans.
Original retail price: $160. Current offers vary.
Independent Expert Category Scores
Some running shoes feel great in the store but become tiring during longer runs. The InfinityRN 4 raises that concern because of its weight.
I’m Steven Tyler, and this Nike InfinityRN 4 review uses published lab measurements, expert evaluations, and customer feedback. I haven’t personally wear-tested this pair.
The main question is whether its cushioning makes up for its bulk. The results reveal some clear trade-offs.
What Is the Nike InfinityRN 4 and Who Is It For?
The Nike InfinityRN 4 is a neutral road-running shoe designed for easy runs, recovery sessions, and daily comfort. It uses ReactX foam, a rocker-shaped sole, and an updated Flyknit upper.
Its wide forefoot platform helps create a steady ride. However, it isn’t a corrective stability shoe or a fast racing trainer.
Nike designed the ReactX foam to improve cushioning and energy return over the older React material. Independent reviewers agree that the shoe feels comfortable, although they disagree on how lively the ride feels.
The upper has a soft, sock-like structure. Its low-volume fit can feel tight, especially over the toes.
For runners who favor a relaxed pace, the combination works well. Those seeking quick transitions and a light feel should look elsewhere.
- Run mostly at easy or recovery paces.
- Prefer cushioned shoes with a steady platform.
- Want one shoe for walking and relaxed running.
- You need lightweight shoes for faster runs.
- Your feet become hot in thick knit uppers.
- You need more room above your toes.
Nike InfinityRN 4 Pros and Cons
The biggest strength is soft comfort during easy mileage. Its main weakness is the weight, followed closely by the snug fit.
The outsole also performs well in wear testing, but its wet-surface traction is less impressive. These differences matter when choosing a daily trainer.
- Soft ReactX foam helps make easy runs feel comfortable.
- Wide forefoot platform creates a more stable landing feel.
- Durable rubber outsole shows low wear in laboratory testing.
- Stretchy Flyknit offers a soft feel around the foot.
- Heavy 316-gram lab weight limits the shoe’s speed appeal.
- Snug sizing can make standard shoe sizes feel short.
- Warm Flyknit upper is less suitable for hot weather.
- Wet-surface traction falls below the tested category average.
Nike InfinityRN 4 Key Features — What Do Tests Show?
Is ReactX Cushioning Soft Enough for Easy Runs?
Yes. The ReactX midsole is soft, but its measured impact protection isn’t class-leading. RunRepeat recorded 124 SA heel shock absorption against its category average of 131 SA.
The same lab measured 59.8% forefoot energy return, slightly below its 61.5% average. That helps explain why the shoe feels comfortable without delivering outstanding bounce.
Heel Shock Absorption — RunRepeat Lab Data
ASICS Gel-Nimbus 26 — 135 SA
Category average — 131 SA
Nike InfinityRN 4 — 124 SA
Higher SA means greater measured shock absorption. Bars are scaled to the highest displayed result, not to an absolute maximum.
Takeaway: Soft foam doesn’t always produce the highest measured shock absorption.
Does the Nike InfinityRN 4 Fit True to Size?
No. Nike recommends choosing half a size larger. RunRepeat’s fit assessment also identifies the shoe as running half a size small.
Its measured toe-box height is 22.4 mm, compared with a 27.0 mm category average. The stretchy upper helps, but it cannot suit every foot shape.
Takeaway: Check your toe space before buying your usual size.
Try your normal size and half a size larger if possible. Check toe clearance while standing.
Is the Flyknit Upper Breathable?
The Flyknit upper feels smooth, but its breathability is only moderate. RunRepeat rated it 3 out of 5 in its older breathability test.
The shoe also includes a water-repellent liner near the toes. That can offer some protection from damp conditions, but it doesn’t make the entire shoe waterproof.
Takeaway: Comfort is strong, but ventilation is not its best feature.
How Durable Is the Nike InfinityRN 4 Outsole?
Outsole durability is a major strength. RunRepeat measured only 0.3 mm of rubber damage in its abrasion test, compared with a 1.1 mm average.
The outsole uses Nike’s Waffle traction pattern and substantial rubber coverage. That contributes to longevity but also adds weight.
Takeaway: Extra rubber helps durability, even when it hurts weight.
Inspect outsole wear regularly. Replace running shoes based on changes in cushioning, grip, and comfort.
Is the InfinityRN 4 Stable on Wet Roads?
The broad platform provides useful support on level roads. However, wet traction is weaker than the lab’s category average.
RunRepeat measured a 0.43 forefoot traction coefficient, compared with 0.53 for its tested average. The ASICS Gel-Nimbus 26 reached 0.85 in the same published test category.
Wet Forefoot Traction — Lab Comparison
ASICS Gel-Nimbus 26 — 0.85
Category average — 0.53
Nike InfinityRN 4 — 0.43
Takeaway: Its secure platform doesn’t guarantee superior grip on wet surfaces.
Take extra care on slick pavement, painted markings, and wet metal surfaces. This shoe is not designed for icy conditions.
How Does the Nike InfinityRN 4 Perform in Real Tests?
Published lab data shows a durable, soft daily trainer with some clear performance limits. Its 316-gram weight is higher than the 261-gram running-shoe average reported by RunRepeat.
Independent Performance Measurements
0.3 mm damage — lower wear than the 1.1 mm average.
12.5 HA — softer than the 20.1 HA average using the same test method.
3/5 — below the tested 3.6/5 average.
316 g — heavier than the 261 g category average.
These are RunRepeat laboratory findings, not measurements taken by Footwearhiker. They explain why comfort and durability stand out more than speed.
Nike InfinityRN 4 Full Specifications
These specifications combine Nike’s published product information with independently reported measurements. Brand figures and lab measurements can differ because their methods differ.
| Design and Fit | |
| Brand | Nike |
| Model | InfinityRN 4 |
| Category | Neutral road daily trainer |
| Upper | Flyknit |
| Sizing | Half-size-up recommended |
| Midsole and Ride | |
| Foam | ReactX |
| Brand heel stack | 39 mm |
| Brand forefoot stack | 30 mm |
| Brand drop | 9 mm |
| Lab-measured drop | 9.8 mm |
| Construction | |
| Lab-measured weight | 316 g / 11.1 oz |
| Outsole | Rubber Waffle pattern |
| Removable insole | Yes |
| Carbon plate | No |
| Reflective elements | No, in tested sample |
The key specification is weight: the shoe provides cushioning and rubber coverage, but it doesn’t feel light for its class.
How Does the Nike InfinityRN 4 Compare to Competitors?
The ASICS Gel-Nimbus 26 is stronger for wet grip and higher measured heel shock absorption. The Brooks Glycerin 21 offers a lighter alternative with a more traditional running feel.
Nike InfinityRN 4 vs ASICS Gel-Nimbus 26
The Gel-Nimbus 26 wins on measured wet traction and heel impact absorption. It weighs 303 g in RunRepeat testing, compared with the Nike’s 316 g, and offers more measured room across the widest part of the forefoot.
Nike InfinityRN 4 vs Brooks Glycerin 21
The Brooks Glycerin 21 is the lighter choice at 278 g in RunRepeat testing. Its DNA LOFT v3 foam and familiar running geometry make it a strong alternative for comfortable daily miles.
All three shoes launched around the same $160 retail price. Their original specifications provide a more reliable comparison than changing clearance prices.
| Feature | InfinityRN 4 | Nimbus 26 | Glycerin 21 |
|---|---|---|---|
| Launch price | $160 | $160 | $160 |
| Lab weight | 316 g | 303 g | 278 g |
| Brand drop | 9 mm | 8 mm | 10 mm |
| Heel shock absorption | 124 SA | 135 SA | 133 SA |
| Wet forefoot traction | 0.43 | 0.85 | 0.48 |
| Midsole | ReactX | FF BLAST PLUS ECO | DNA LOFT v3 |
| Best for | Easy comfort | Plush long runs | Lighter daily miles |
For further measurements, see the independent InfinityRN 4 laboratory review. Compare fit carefully rather than choosing by cushioning alone.
Nike InfinityRN 4 Pricing — Is It Worth the Price?
The InfinityRN 4 offers better value at a substantial discount than at its $160 launch price. Its weight and moderate energy return make full retail harder to justify beside newer trainers.
A third-party Amazon price tracker recently displayed $116.38 for one listing and recorded an $84.99 sale. Another tracked listing displayed $82.99, showing how much prices vary across variants.
These are tracked offers, not a verified lowest-ever price for every size and color. Check the actual seller, size, condition, and return policy.
Nike InfinityRN 4 ReactX Cushioned Road Running Shoes
Worth considering when discounted and available in your correct size.
Who Should Buy the Nike InfinityRN 4?
Buy the InfinityRN 4 if you want comfortable, steady shoes for relaxed road mileage. Its strengths fit runners who value protection and outsole life more than fast turnover.
- Heel strikers who enjoy a cushioned, higher-drop daily trainer.
- Walkers wanting a comfortable shoe for long daily use.
- Runners prioritizing durable rubber over low shoe weight.
- You want one lightweight trainer for every workout pace.
- You have high-volume feet that dislike low toe-box ceilings.
- You often run on wet, slippery urban surfaces.
Bottom line: Choose the InfinityRN 4 for comfortable easy miles, preferably at a discount.
What Are Real Buyers Saying About the Nike InfinityRN 4?
Retailer feedback generally praises comfort but raises concerns about sizing. Nordstrom displayed a 4.2 out of 5 customer rating across 366 reviews when checked.
That figure is from Nordstrom, not Amazon. A reliable, directly verified Amazon rating and review count were unavailable.
Customer Feedback Snapshot
4.2/5
366 Nordstrom customer reviews at the time checked.
- Comfortable cushioning makes long walks feel easier for many users.
- Stretchy fabric creates a soft feel against the foot.
- Versatile styling works for running and casual daily wear.
- Usual sizes can feel too short or too snug.
- Some wearers experience pressure around the forefoot or toes.
- The bulky build doesn’t satisfy every running shoe buyer.
Read the customer reviews and sizing feedback before ordering. Individual fit experiences differ.
Final Verdict — Does the Nike InfinityRN 4 Justify Its Weight?
The Nike InfinityRN 4 is a worthwhile easy-running shoe for the right buyer. It delivers a soft underfoot feel, dependable everyday comfort, and strong outsole durability. Its broad platform is also reassuring during steady miles. However, it is heavy, its upper can become warm, and its fit runs short. Independent laboratory results also show below-average wet traction and heel shock absorption. I recommend it most for relaxed road running and walking, especially when discounted. Fast runners and buyers needing roomy shoes have stronger alternatives. Getting the fit right matters more than choosing the most attractive color.
My recommendation: Buy it for comfort and durability, not for speed or maximum bounce.
Nike InfinityRN 4 ReactX Cushioned Road Running Shoes
Check the available sizes and current price before choosing.
Frequently Asked Questions
Is the Nike InfinityRN 4 good for long runs?
Yes, the InfinityRN 4 can suit long runs at an easy pace. Its ReactX cushioning and stable platform help support steady mileage. However, its 316-gram lab weight can feel bulky during longer efforts, especially if you normally wear lighter running shoes.
Should I size up in the Nike InfinityRN 4?
Yes, Nike recommends ordering half a size larger. Independent fit research supports that advice. RunRepeat measured a low 22.4 mm toe-box height, so people with high-volume feet should be especially careful about sizing. Check the return policy before buying.
Is the Nike InfinityRN 4 good for walking?
Yes, it works well for walking when the fit is comfortable. Its cushioning, rocker geometry, and durable outsole suit daily use. The high shoe weight is less important for some walkers than for faster runners, but comfort still depends on individual fit.
Is the Nike InfinityRN 4 waterproof?
No, the InfinityRN 4 is not a fully waterproof running shoe. Nike includes a water-repellent liner near the toes, but water can still enter through the Flyknit upper. Independent testers reported that the material can become soaked during rain and take time to dry.
Does the Nike InfinityRN 4 help prevent injuries?
No running shoe can guarantee injury prevention. The InfinityRN 4 offers cushioning and moderate stability, but that does not prove it prevents running injuries. Fit, training load, strength, and individual biomechanics all matter. Its 9 mm advertised drop may feel different from lower-drop shoes.
Is the Nike InfinityRN 4 better than the Gel-Nimbus 26?
It depends on your priorities. The Gel-Nimbus 26 provides greater measured heel shock absorption and stronger wet traction. The InfinityRN 4 offers a softer foam measurement and durable outsole. Try both if possible, since their fit and underfoot feel differ.
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