Puma’s latest Nitro Lab model sits outside competition rules by design, pairing two fused carbon-fiber plates with its highest-return foam. Internal testing puts it top of the brand’s road range for running economy.
At €350, Puma’s Fast-RB Nitro Elite 2 comes with an unusual caveat for a performance running shoe: it is not legal for competition. Launching on Oct. 28, the second Fast-RB model gives the brand room to explore designs outside the constraints of race footwear.
PUMA describes the shoe as its most efficient yet, based on running economy measured in internal studies. That is the company’s assessment, rather than an independently established comparison, but it explains the emphasis of the project: testing how far the combination of foam, plates and geometry can go.
The design centers on two carbon-fiber PWRPlates fused into a structure that Puma likens to a springboard. These sit alongside Nitrofoam Elite cushioning and a revised geometry intended to produce a smoother ride. Rather than adding more complexity, the development team says it simplified the construction to give the foam more room to work.
Romain Girard, Puma’s VP of Innovation, said the result delivered the highest energy return the company had recorded in its testing. The shoe took two years of development, laboratory testing and work with athletes, according to Girard. Energy return and running economy are different measures, however; neither claim establishes how much benefit an individual runner will experience.
The rest of the construction serves more familiar purposes. An Ultraweave upper is designed to reduce weight while holding the foot in place, and a PUMAGrip outsole provides traction. The shoe weighs 250 grams in a UK 8 and 206 grams in a UK 4.5, with an 8 mm heel-to-toe drop. PUMA puts its expected lifespan at 320 km, or 200 miles.
Availability will be limited, with sales through puma.com, selected PUMA stores and selected retailers across the US, the UK, Central Europe, the Nordics, Latin America, Thailand, Japan, China and Australia. For buyers, the proposition is specific: a €350 running shoe built to test performance ideas, but not one they can take into competition.
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