Nike React Infinity Run FK 3
The RW to go: React foam underfoot feels great whether you’re ready for an easy jog or something more spirited.
- The upper is well designed, but slightly snug
- Long-lasting foam feels great at different speeds
- Padded heel provides a locked-in fit
Lester: 10.3 ounces (M), 8.3 ounces (W)
Drop: 9 millimeters
The new Infinity reminds me of when Nike first rolled out Flyknit in running shoes and released a slew of wild designs. Our test swatches, especially the men’s ones, looked like they were made from airport carpet or ’70s couch fabric. But once the aesthetics wore off, the raves began.
“My legs were completely knocked out when I tested this shoe, but it treated my aching legs well,” said one tester after running 3:16 and 3:17 marathons just six weeks apart. “They are comfortable but without the feeling of low energy return.”
That’s the magic of React foam. Nike has also used this material in basketball shoes because of its protective rebound – in both sports you need the foam to cushion a lot of impact, but also to allow you to rebound quickly. The trade-off, usually, is extra weight. There are lighter, bouncy, and sexier foams on the market right now, including the PEBA-based ZoomX that Nike uses in its fastest running shoes like the Vaporfly and Alphaflybut there’s undeniable comfort in a shoe that lets you turn on cruise control.
React foam provides the same sinking and releasing feel for hundreds of miles without compressing or bunching like lighter foams. And, unlike the EVA that shoes have been made from for decades, React foam isn’t as harsh on cold days or completely lifeless when walking on a scorching black roof.
This upper, while polarizing, provides a locked-in fit that runners with medium width or narrow feet love. But, testers with wider feet complained that the knit just didn’t offer enough stretch to make them comfortable for more than a few miles. The rear half of the shoe has been reinforced with lightly padded lining around the heel and in the tongue. “I like mixed knit materials,” said one tester. “It’s like a cozy blanket around my foot.”
Review of the tester
Craig W | 39 years old
Weekly mileage: 40
“Comfort and cushioning come without the expense of speed. The shoe was comfortable at an 8:30 pace and equally comfortable at a 6:30 pace, which is a rare combination. The upper seems to lack support due to the flexibility of the material but that just wasn’t the case here My foot was encased in one of the softest materials you’ll see in a running shoe I have a slew of daily trainers including choose, and with the exception of speed days, I would choose this shoe again and again.