Products

Nike InfinityRN 4 Buying Guide: Models, Fit & Key Features

Posted on by William Zheng

Looking for a wireless earbud that blends style, comfort, and exceptional sound? The Infinity RN 4 could be your perfect pick. Designed for music lovers and on-the-go users, this model offers impressive audio quality, long-lasting battery life, and a sleek, modern look—all at an affordable price. Our comprehensive shopping guide will help you decide if the Infinity RN 4 meets your needs.

Nike InfinityRN 4 Buying Guide: The Complete Consumer Handbook

Nike InfinityRN 4: Model Comparison Table

Model/Variation Upper Material Cushion Type Stack Height (Heel/Forefoot) Weight (Men/Women) Recommended Fit Intended Usage Special Features Price (USD)
InfinityRN 4 Standard Stretch Flyknit ReactX 39mm/30mm 11.1oz/9.4oz Half-size up advised Daily training, walking Soft, bouncy, eco-friendly $160
InfinityRN 4 Wide Stretch Flyknit ReactX 39mm/30mm 11.1oz/9.4oz True/wider fit Daily training, walking Extra room in midfoot/toebox $160
InfinityRN 4 Customizable Stretch Flyknit ReactX 39mm/30mm 11.1oz/9.4oz Custom size options Lifestyle & running “Nike By You” color options $190

Note: Specifications may vary slightly by colorway and gender. Always check sizing and details when purchasing.

Everyday Usage: How the Nike InfinityRN 4 Fits Your Life

Who Should Use the InfinityRN 4?

  • Daily Runners: Designed for comfort over long or frequent runs. Ideal for easy to moderate paces.
  • Recreational Athletes & Walkers: Its plush cushioning makes it stand out for walking, standing, or everyday wear.
  • Beginners: Supportive, stable platform supports those transitioning into regular running or fitness.
  • Recovery & Comfort Seekers: The extra-soft foam is great for recovery days, tired legs, or anyone who values joint-friendly shoes.

Typical Scenarios of Use

  • Road running (short, medium, or long distances)
  • Urban walks, commutes, or errands
  • All-day support (for retail workers, teachers, nurses, etc.)
  • Fitness classes and light cross-training
  • Travel, thanks to cushioned support for hours on your feet

Not Ideal For

  • Speed Workouts or Racing: Heavier compared to elite trainers; not built for interval training or racing.
  • Technical trails/off-road: Designed primarily for road and urban pavement.

Benefits of the Nike InfinityRN 4

1. Supreme Cushioning and Comfort

  • ReactX midsole: Delivers a cloud-like softness (12.5 HA durometer, 20% softer than previous versions).
  • High stack height: At 39mm in the heel and 30mm in the forefoot, you experience gentle, consistent underfoot protection.

2. Stable, Supportive Design

  • Broader base: One of the widest forefoots among running shoes, providing balance and reducing fatigue.
  • Subtle side walls: Molded foam gently cradles the foot to limit rolling and help guide your stride without rigid posts.

3. Versatile Fit and Adaptability

  • Stretch Flyknit upper: Adapts to most foot shapes (especially wider feet), reducing hot spots or discomfort.
  • Gusseted tongue: Ensures a secure, stable midfoot fit and keeps the tongue in place.

4. Sustainability

  • Lower Carbon Footprint: The ReactX foam uses a direct-injection process with 43% less carbon emissions than traditional foams.

5. Durability

  • Robust outsole: Full-length, hard-wearing rubber with multi-directional micro-lugs ensures long-lasting grip and tread longevity.

How to Choose the Right InfinityRN 4 Model For You

A Step-by-Step Checklist

  1. Know Your Foot Type and Fit Preferences
  2. Standard and wide fits available; the standard version runs small—choose half a size up unless you have narrow feet.

  3. For high-volume (taller) or wider feet, consider the wide or “Nike by You” customizable options.

  4. Decide on the Intended Usage

  5. If you want a plush, forgiving shoe for long walks or runs: Standard model suits most people.

  6. If you also want style versatility, choose the customizable (“Nike by You”) option.

  7. Assess Cushion and Stability Needs

  8. If you’ve had joint, shin, or foot pain with harder-soled shoes, the new ReactX foam offers more comfort.

  9. If you need more pronounced stability due to overpronation, consider shoes in other ranges with built-in stability tech.

  10. Consider Breathability and Upper Feel

  11. The knit upper is soft and foot-hugging but can be warm in hot climates. If overheating is an issue, choose lighter mesh offerings elsewhere.

  12. Set Your Budget

  13. Standard & wide models: $160.
  14. Customization (“Nike by You”): $190 (extra charge for custom design/colors).

Practical Tips for Getting the Most from Your InfinityRN 4

Sizing and Fit

  • Go up half a size if you have normal or wide feet; those with very narrow feet may go true to size for a snugger fit.
  • Try both feet: If possible, visit a store and walk or jog around to test the feel.
  • Break-in period: The soft upper and new foam need very little break-in, but give them a few runs to fully adapt to your foot.

Usage & Rotation

  • Alternate shoes: For performance/speed runs or trails, rotate with a lighter or more technical shoe.
  • Everyday wear: Thanks to high comfort, it’s safe for all-day use. However, if you use them for running and daily wear, expect the outsole to show wear faster.

Maintenance

  • Cleaning: Remove insoles and air dry regularly. The white upper stains easily—spot clean with mild soap and a toothbrush.
  • Odor management: The thick knit may keep feet warm. Use moisture-wicking socks and dry thoroughly between uses.
  • Storage: Air out after every use to preserve upper integrity and midsole bounce.

Longevity

  • Typical running shoe mileage varies, but with ReactX foam and robust outsole, expect 350-500 miles with good care.

Key Technical Features Comparison Table

Attribute InfinityRN 4 Std. InfinityRN 4 Wide InfinityRN 4 Custom Notes
Stack Height (heel/ff) 39mm/30mm 39mm/30mm 39mm/30mm All with 9mm drop
Weight (men’s 9) 11.1 oz (314g) 11.3 oz (320g) ~11.1 oz Slight increase with wide/custom upper
Cushion Material ReactX ReactX ReactX 13% more energy return than old React, 43% less CO₂
Upper Stretch Flyknit Stretch Flyknit Stretch Flyknit Customizable color/design with “Nike By You”
Outsole Full-length rubber Full-length rubber Full-length rubber Mini-lug pattern, durable
Fit recommendation Half-size up True/wide fit Custom fit Very soft, high stretch
Toebox width 95.3 mm ~97+ mm Custom Ample stretch, works well for most
Toebox height 22.4 mm 23+ mm Custom Low vertical space; stretchy upper helps mitigate
Insole thickness 3.1 mm 3.1 mm 3.1 mm Thinner than most, maximizing foam feel
Torsional rigidity 3/5 3/5 3/5 Some flexibility, not unstable; mild “neutral” feel
Special features Gusseted tongue Gusseted tongue Gusseted tongue “Flyknit fit band” midfoot support

Best Practices: Choosing and Using the InfinityRN 4

1. Prioritize Fit Over Sizing Label

  • Many users report the shoe runs a little small; try half a size up, especially if you have average to wide feet or like extra toe room.

2. Evaluate Your Usage Profile

  • For easy and recovery runs: This shoe shines.
  • For long distance or walking: ReactX cushioning saves legs and joints.


Cut in half: Nike InfinityRN 4 Review | RunRepeat - infinity rn 4

3. Adapt Sock Choice

  • Breathable, moisture-wicking socks reduce possibility of heat and sweat buildup in the thicker Flyknit.

4. Adjust Lacing for Feel

  • Use the extra top eyelet for heel lock lacing if you experience any heel slippage or want a more secure fit.
  • Loosen laces in the forefoot if you have high insteps or want extra toe space.

5. Switch to Alternate Shoes for Speed Days

  • If you perform interval training or races, rotate in a lighter, more responsive shoe to maximize performance.

6. Monitor Outsole Wear

  • Inspect the sole regularly. If you begin to lose traction, especially at the forefoot, consider replacing.

7. Keep Them Fresh

  • Wash and air out occasionally, especially if you use them for daily commuting.

8. Maximize Upper Comfort

  • If you have high-volume feet, you’ll enjoy the stretch Flyknit. If you have narrow feet, consider snug, thicker socks for a better fit.

Related Video

Conclusion

The Nike InfinityRN 4 stands apart as a modern, maximal-cushion daily trainer focused on premium comfort and broad usability. With its plush ReactX foam, wide base, and stretch-knit upper, it handles long runs, daily errands, and recovery walks with ease, all while providing an eco-conscious upgrade over its predecessors.

Mild, adaptive stability features, supportive sidewalls, and a secure fit make it suitable for most neutral runners and even those needing a touch of guidance. While it won’t be the lightest or fastest shoe in your rotation, few can match its plush comfort, durability, and all-day wearability.

For runners, walkers, professionals on their feet, or anyone seeking a reliable, luxurious everyday shoe, the InfinityRN 4 is a worthwhile investment. Just remember: size up half if in doubt and enjoy the cloud-like ride mile after mile.

FAQ

  1. Is the Nike InfinityRN 4 suitable for both beginners and advanced runners?
    Yes, it’s an excellent choice for beginners due to its comfort and mild guidance. Experienced runners will appreciate it for easy or recovery runs, though they may want a lighter, more responsive shoe for speedwork or races.

  2. Does the InfinityRN 4 run true to size?
    Most users find it runs about a half-size small because of its low forefoot volume and snug fit. Size up by half unless you have a very narrow foot.

  3. What makes the ReactX foam different from previous versions?
    ReactX foam is significantly softer (about 20%) and offers more bounce compared to old React. It also has a 43% lower carbon footprint, making it more eco-friendly.

  4. Is the Flyknit upper breathable?
    The Flyknit is soft and adapts to your foot, providing comfort and stretch. However, it can feel warm, especially in hot weather. Choose thinner, moisture-wicking socks to stay cool.

  5. How durable is the InfinityRN 4?
    With a robust full-length outsole and thick cushioning, most runners/walkers can expect 350-500 miles of use before significant wear. The upper and outsole are designed for daily use.

  6. Is the InfinityRN 4 good for people with wide feet?
    Yes! The stretch Flyknit upper and wide version accommodate wider feet well. The roomy toebox and stretchy fabric help prevent squeezing or discomfort.

  7. Can I use the InfinityRN 4 for walking and standing all day?
    Absolutely. Its plush cushioning and secure fit make it ideal for people who are on their feet for hours, like teachers, nurses, or retail workers.

  8. How does the InfinityRN 4 perform in wet conditions?
    Outsole grip is average—secure enough for day-to-day use but not outstanding in rain or slick surfaces. Caution is advised during heavy rainfall or on very smooth wet ground.

  9. Are there any stability features in the InfinityRN 4?
    While technically a neutral shoe, it has wide base geometry, midsole sidewalls, and a subtle heel clip, providing mild guidance and stability for many users.

  10. How does it compare to shoes like the Nike Invincible 3 or Hoka Clifton?
    The Invincible 3 is lighter and bouncier, better for performance, but less stable. The Clifton is also max-cushion but fits differently and is a touch firmer. InfinityRN 4 shines for everyday comfort, roomy fit, and plush ride.

Post Views: 7