Is the New Balance FuelCell SuperComp Trainer v3 suitable for marathon race day?

While designed primarily as a high-mileage training shoe, many runners use it for marathon races due to its carbon plate and thick FuelCell foam cushioning.

How does the fit of the SC Trainer v3 run?

It generally fits true to size, though runners with wider feet may want to try a half size up or select a wide width option if available.

Can this sneaker be used for casual everyday walking?

The carbon fiber plate and aggressive rocker profile are designed for forward running motion, making it less comfortable for slow walking or standing.

Do Canadian retailers ship this model across Canada?

Yes, Canadian sneaker and running specialty retailers stock this model with domestic shipping options across Canada.

New Balance FuelCell SuperComp Trainer v3 Gray Green SS26

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New BalanceMRCX25Rmens

New Balance FuelCell SuperComp Trainer v3 Gray Green SS26

Name: New Balance FuelCell SuperComp Trainer v3 Gray Green SS26
Brand: New Balance
SKU: MRCX25R
Availability: InStock

Gray/Green

Cheapest in Canada

$279.39CAD

at 365Rider

Buy at 365Rider →← All Sneakers

The New Balance FuelCell SuperComp Trainer v3 in Gray and Green is a high-stack marathon training shoe. It features a full-length carbon fiber plate embedded within a soft FuelCell foam midsole. The engineered mesh upper provides breathability and lockdown for long-distance road runs.

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365Rider✓ Best$279.39-In stockEU 42.5, EU 45Buy

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Prices last verified: September 23, 2026

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$279.39

In stock

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About the New Balance FuelCell SuperComp Trainer v3 Gray Green SS26

The New Balance FuelCell SuperComp Trainer v3 is built for high-mileage road running and workout days. This colorway features a gray upper with green accents throughout the midsole and branding. The shoe utilizes a thick FuelCell foam midsole designed for energy return and impact absorption over long distances. Inside the cushioning system sits a full-length carbon fiber plate with Energy Arc technology, which pairs an arched plate with a midsole cavity to store and release energy with every stride. The upper is constructed from lightweight engineered mesh that allows airflow to keep feet cool during extended training sessions. A gusseted tongue and traditional lacing system help secure the midfoot, while structured padding around the heel collar provides rearfoot stability. On the bottom, a targeted rubber outsole delivers traction across dry and wet asphalt while keeping overall weight down. Designed as a daily performance trainer for runners preparing for marathons or half marathons, this model combines maximum cushioning with a propulsion plate.

Pros & Cons

Pros

✓High-stack FuelCell foam provides maximum shock absorption for long runs.
✓Full-length carbon fiber plate assists forward propulsion during tempo workouts.
✓Breathable engineered mesh upper keeps feet cool.
✓Outsole rubber placement offers dependable grip on pavement.

Cons

✕High stack height may feel unstable on uneven terrain or sharp turns.
✕Stiffer ride compared to non-plated daily trainers.
✕Narrow midfoot fit might not suit runners with wider feet.

Who is it for?

Best For

→ Long-distance marathon training runs on paved surfaces.
→ Tempo workouts and fast-paced training sessions.
→ Runners looking for a carbon-plated maximum cushion shoe.

Not Ideal For

– Trail running or off-road gravel paths.
– Casual everyday walking due to the stiff carbon plate.