Nike has listed the InfinityRN 4 for a 13th of July release date. Check Nike Running dealers for availability.
- Nike ReactX foam, debuting in the Nike InfinityRN 4, helps protect the future of sport by equipping runners with higher energy return and a lower carbon footprint than Nike React foam.
- ReactX foam was researched, developed and tested over five years to find a key middle ground between performance and environmental impact. In putting the material through an injection process, rather than through compression molding, the new foam delivers a higher energy return without creating a higher carbon footprint.
- Materials represent about 70% of Nike’s overall carbon footprint. Scaled advances in more sustainable materials will influence the entire sportswear industry to create more environmentally responsible product.
Nike Running has its latest answer in delivering high-level performance while reducing environmental impact: Nike ReactX foam, which is debuting in the new Nike InfinityRN 4.
Compared to Nike React foam, ReactX is engineered to cut down its carbon footprint in a pair of midsoles by at least 43% due to reduced energy in the manufacturing process, and increase energy return by 13%.
The resulting balance between performance and environmental impact in ReactX foam is a feat of sport performance engineering. The industry has two traditional methods of making foam, which can be summarized as either injection or compression molding. The overall process for injection is simpler, and thus carries a lower carbon footprint — but it also tends to have lower energy return, and a lower performance benefit. On the other hand, compression molding delivers more responsive foams with higher energy return, but also creates more waste and uses more energy to make it.
ReactX foam was researched, developed and tested over five years to craft a formulation that hits the sweet spot between performance and environmental impact. In putting the material through an injection process, rather than through compression molding, the new foam delivers a higher energy return without creating a higher carbon footprint.
The new shoe pairs ReactX foam with an all-new Nike Flyknit upper that allows maximum airflow, breathability, flexibility, and containment, with a soft, supportive foam collar. The lightweight fabric uses an average of 60% less waste than traditional footwear-upper manufacturing. The updated upper also features increased volume in the toe, a midfoot support system and a water-resistant liner.
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The next iteration of the Infinity franchise is built to provide supportive cushioning for a smooth run. The InfinityRN 4 introduces Nike’s newest foam innovation: ReactX. The shoe’s testing was led through women runners, whose insights influenced an all-new upper design with updated materials, as well as the soft cushioning underfoot.
Nike ReactX Midsole Nike’s all-new foam innovation, ReactX is a long-lasting foam engineered to cut down its carbon footprint in a pair of midsoles by at least 43% compared to Nike React foam. It’s also more responsive, offering runners 13% more energy return.
Lightweight Upper A new Nike Flyknit upper is made with specific zones of breathability, flexibility, and containment, and a soft, supportive foam collar. The updated upper also features increased volume in the toe and is complemented by a midfoot support system and internal water-resistant liner.
Underfoot Feel The waffle outsole provides durable traction and has a unique rocker design that’s shaped for support during all three phases of your stride. It feels flexible when you push off the ground, has a smooth ride when your foot moves forward, and cushions when you land. The bottom is wider for more stability on contact.
In Our Words “Many people today incorporate running in their lives as a way of powering a holistic betterment journey and they’ve asked us for a shoe that would support their performance and the planet too. The Nike InfinityRN 4, with its ReactX foam innovation, helps us deliver just that. ” – Jeongwoo Lee, Nike Senior Design Director
Weight W8: 281g; M10: 353g
Offset 9mm
Stack Height (M10/W11.5) Forefoot: 30mm; Heel: 39mm
Other Details Snug fit — We recommend ordering a half-size up
Price $160
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