The PUMA Fast-RB Nitro Elite 2 is a wildly innovative racing shoe with a rule-breaking stack height and carbon cantilever system, serving as a symbol to push beyond established limits.
Best Use
Surface
Stability
Road Shoes Types
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Daily TrainersDaily Trainers
As the broad base of the running shoe pyramid, daily trainers are the definition of a go-to running shoe. They prioritize dependable comfort, support, durability, and routine versatility. They're a staple in every runner's closet. If you're newer to running shoes, you can confidently start your journey here.
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Performance TrainersPerformance Trainers
Performance trainers (or "super trainers") blend elements of daily trainers and super shoes, often giving you the benefits of advanced foams and plates while being adapted for daily training. They make fast runs faster and long runs easier. Their high versatility also makes them great choices as accessible racing shoes.
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Race Super ShoesRace Super Shoes
The pinnacle of the pyramid, super shoes are the fastest running shoes you can buy. They're designed to race your absolute best and are the apex of running-shoe technology and innovation. Often built with carbon-fiber plates and cutting-edge superfoams for the highest energy return, they're made for ultimate racing speed.
Surface
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Roads & PavementRoads & Pavement
Road running shoes feature smooth outsoles that are designed for running on paved surfaces such as roads, sidewalks, and bike paths.
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Smooth Trails & FireroadsSmooth Trails & Fireroads
Designed to handle most trail runs, these shoes prioritize comfort and a smooth ride. These shoes are great for anything from smooth singletrack, park trails, and fireroads making them ideal for those who run from their doorstep on streets before hitting the trail.
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Rocky & Technical TrailsRocky & Technical Trails
These shoes are best used for hard, rugged trails such as shale, granite or sandstone where grip on smooth surfaces and underfoot protection are important.
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Soft & Muddy TrailsSoft & Muddy Trails
Designed for use in muddy, soggy conditions, these shoes feature very aggressive outsoles that dig deep into soft ground for exceptional traction.
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Snowy & Icy TrailsSnowy & Icy Trails
These shoes feature technical outsoles designed to grip snowy and icy trails making them ideal for winter trail running.
Stability Level
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Neutral Running Shoes
Neutral shoes support the foot through a normal range of arch collapse and generally do not have built-in technology to correct movement.
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Stability Running Shoes
Stability shoes are a great option for those who overpronate or need added support. These shoes help to limit the inward rolling motion of the ankle while running or walking and assist in guiding the foot straight through the gait cycle.
At A Glance:
- Dual-carbon-plated cantilever propulsion system
- Responsive, ever-energetic NITROFOAM Elite
- Rule-breaking innovation
Product Highlights:
PUMA has once again broken the rules in the coolest way possible with the Fast-RB Nitro Elite 2. This shoe is packed with the potential to deliver remarkable race-day experiences in a package that doesn't feel (or look) like anything else on the market. Ignoring World Athletics official guidelines, PUMA has cooked up a beast of a shoe that is sure to turn heads as you fly by.
Where to begin? Let's dive into this innovative midsole. Underfoot, two carbon fiber plates are fused to form a cantilever structure. This essentially forms a pre-loaded spring under your feet that's ready to explode with energy and speed at any moment. Above, below, and between these plates is a top-tier racing midsole, fully composed of NITROFOAM Elite foam. This adds softness, cushioning, and extra propulsion underfoot to send you hurling towards the finish line.
As crazy as it looks, this underfoot experience has been carefully designed to work for any type of footstrike, from heel strikers to forefoot strikers. No matter how you land, this shoe will respond by rebounding wild amounts of energy for an underfoot experience unlike anything the running world has ever seen.
A thin, race-ready upper locks you into this unique platform, offering peak breathability and hints of padding where you need it most. Underfoot, you'll find PUMAGRIP LT, which has been specifically engineered to handle the intense forces that this shoe generates. It'll give you all the traction you need for aggressive speed, letting the cantilever do its thing without losing any forward momentum in the process.
This shoe isn't race legal, but the fun is real. PUMA is here to show us that they're not afraid to experiment, push limits, and put out original ideas. The Fast-RB Nitro Elite 2 (a concept car of a shoe) is a prime example of innovation, love for the sport, and what PUMA is all about.
Model Number: 31498404
Specs & FitLearn More
Shoe Specs
- Weight: 8.7 oz | 247 g
- Heel Stack: 57 mm (when heel is on the ground)
- Forefoot Stack: 49 mm
- Heel-Toe Offset: 8 mm (when heel is on the ground)
Stack Height
Stack Height
Stack height refers to how much shoe is between your foot and the ground. For this category, we reference the amount of material below the forefoot, as the heel height will be equal to or greater than the forefoot height.
Learn more about stack heights and how we measure them.-
Minimal
14-18 mm. The shoe has a thin midsole that allows for a natural running experience. Classic racing flats and minimalist shoes are common here. These shoes offer a feeling of being directly connected to the road or trail.
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Low
19-23 mm. The shoe has a slightly cushioned feel and might feature additional midsole technologies. Performance training shoes and some trail shoes are common here. These offer some protection during foot strike but prioritize a lightweight, grounded experience.
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Medium
24-28 mm. These shoes have a stack height that falls near the middle of the spectrum. The shoes in this category are versatile and great for almost all types of runs and distances.
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High
29-34 mm. The shoe has a thick midsole and ample cushioning. These shoes are highly protective and absorb more of the impact you experience.
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Maximal
35 mm plus. The shoe has an extremely thick midsole and extra cushioning. The focus is on maximum protection underfoot, often with a plush experience for hardly any ground feel. Some pinnacle racing and performance shoes can also be found here.
How We Measure Our Shoe Specs
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We measure every shoe in-house to provide accurate and consistent details.
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Weight
Weight is measured per single shoe, including laces. Men's and unisex styles are based on a men's size 9, and women's styles are based on a women's size 8.
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Heel Stack
The heel stack refers to how high your heel sits above the ground when wearing shoes. Based on Men's size 9 as the standard.
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Forefoot Stack
Forefoot stack refers to how high the ball of the foot sits above the ground when wearing shoes. Based on Men's size 9 as the standard.
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Heel-toe Offset
Heel-toe offset (drop) is the difference in height between the heel stack and the forefoot stack. We use the number given to us by the brand.
How We Measure Shoe Fit
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All measurements are based on Medium width. Note: fit is relative to the "average" running shoe.
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We partner with SmartLast, a program by Heeluxe, to use advanced shoe-measuring technology, to provide objective measurements for toe box, midfoot, and heel widths as well as overall length.
Learn more about the SmartLast measuring process here.
Stack Height
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MinimalMinimal
14-18 mm. The shoe has a thin midsole that allows for a natural running experience. Classic racing flats and minimalist shoes are common here. These shoes offer a feeling of being directly connected to the road or trail.
-
LowLow
19-23 mm. The shoe has a slightly cushioned feel and might feature additional midsole technologies. Performance training shoes and some trail shoes are common here. These offer some protection during foot strike but prioritize a lightweight, grounded experience.
-
MediumMedium
24-28 mm. These shoes have a stack height that falls near the middle of the spectrum. The shoes in this category are versatile and great for almost all types of runs and distances.
-
HighHigh
29-34 mm. The shoe has a thick midsole and ample cushioning. These shoes are highly protective and absorb more of the impact you experience.
-
MaximalMaximal
35 mm plus. The shoe has an extremely thick midsole and extra cushioning. The focus is on maximum protection underfoot, often with a plush experience for hardly any ground feel. Some pinnacle racing and performance shoes can also be found here.
Technologies
MIDSOLE
- Cantilever Springboard fuses two carbon fiber plates to form a unique pre-loaded spring sensation. This system will flex, load, and release throughout your stride to propel you to new speeds.
- NITROFOAM ELITE is an ATPU foam designed to cushion, rebound, and offer explosive energy return as you work through the cantilever system. Found above, below, and between carbon layers, this foam smooths out each part of your stride and offers elite-level energy return in the process.
UPPER
- ULTRAWEAVE engineered mesh provides a lightweight and breathable race fit.
- PWRTAPE overlays have been reduced to provide just the right amount of strategic support.
OUTSOLE
- PUMAGRIP LT is a lightweight CPU engineered to handle the intense forces this shoe can produce. It's thin, durable, and offers aggressive traction, so you don't lose any energy as you push off.