What Each Midsole Actually Does and Which One You Should Choose
ASICS has one of the most layered cushioning systems in running shoes today, but the naming doesn’t make it easy. Terms like FF BLAST+, ECO, and Turbo sound technical, yet they don’t clearly tell you how a shoe will feel when you’re walking, running, or standing all day.
Once you understand how each foam behaves underfoot, the lineup becomes much easier to navigate. Some are built to absorb impact and protect your joints. Others are designed to return energy and help you move faster. A few sit somewhere in between.
This guide breaks that down in plain terms, then connects each foam to the actual shoes you’ll find online.
The Shift from Firm to Soft: How ASICS Foam Has Evolved
If you’ve worn ASICS shoes for a long time, you’ve probably noticed the change.
Early Technology: FlyteFoam
Older models relied heavily on FlyteFoam, which was durable and stable but often felt firm. It worked well for support, especially in stability shoes, but didn’t offer much bounce or softness.
The newer generation, led by FF BLAST+, moves in the opposite direction. The feel is lighter, softer, and more forgiving, with just enough rebound to keep the ride from feeling flat.
That shift mirrors what’s happened across the industry. Runners and walkers now expect cushioning that reduces fatigue without sacrificing responsiveness.
FF BLAST MAX: Maximum Cushioning Without Losing Stability
FF BLAST MAX is ASICS’ move into true max-cushion territory, designed to deliver an even softer, higher-stack experience than FF BLAST+ ECO while maintaining a stable, controlled ride.
On foot, the difference is noticeable right away. There’s more foam under you, which means greater shock absorption and a more pronounced “floating” sensation compared to standard FF BLAST+ models. At the same time, ASICS has tuned the geometry to keep the platform from feeling unstable or overly squishy, which can sometimes be a problem in high-stack shoes.
This foam is built for comfort over long durations. It reduces impact on joints, helps limit fatigue during extended walks or runs, and works especially well for people who want that ultra-cushioned feel without stepping into performance-focused or overly bouncy territory.
You’ll typically see FF BLAST MAX in newer, more comfort-driven models like the Novablast 5, where ASICS is pushing toward higher stack heights and more modern ride dynamics.
If FF BLAST+ ECO is about balanced softness, FF BLAST MAX takes it a step further. It’s for people who want the most cushioning ASICS offers, particularly for long days on their feet, recovery runs, or heavier runners who benefit from extra impact protection.
FF BLAST+ ECO: Built for Comfort First
FF BLAST+ ECO sits at the comfort end of the spectrum. On foot, it feels soft and protective, the kind of cushioning that takes the edge off hard pavement. There’s a bit of bounce, but it’s subtle. The priority here is reducing impact, not pushing you forward.
This is why it shows up in models like the GEL-Nimbus. These are shoes people reach for when they’re dealing with joint discomfort, long hours on their feet, or recovery days where the goal is simply to move comfortably.
The “ECO” part comes from the materials. ASICS blends in bio-based components to reduce reliance on petroleum-based inputs. It doesn’t change the ride dramatically, but it does position the foam as part of a broader shift toward more sustainable manufacturing.
If your focus is walking, joint protection, or everyday comfort, this is the safest place to start.
FF BLAST+: The Middle Ground Most People Need
Right in the center of the lineup is FF BLAST+. This is the foam that tries to do a bit of everything. It’s lighter than older ASICS materials, moderately soft, and responsive enough to handle both walking and running.
It doesn’t sink as much as FF BLAST+ ECO, and it doesn’t push back as aggressively as Turbo. That balance is what makes it a strong choice for daily trainers.
If you don’t have a specific problem to solve, no major foot pain, no need for race-day performance, this is usually the foam that feels “right” without much adjustment.
FF BLAST+ Turbo: Where Speed Becomes the Priority
FF BLAST+ Turbo is a different experience entirely. The softness drops, the responsiveness increases, and the foam starts to feel more directional. Instead of absorbing your movement, it channels it forward.
This is the foam used in ASICS’ performance shoes, often paired with carbon plates and aggressive geometries. It’s built for runners who care about pace, efficiency, and energy return. For walking or long days on your feet, it can feel a bit firm and less forgiving. But for faster efforts, that firmness is exactly what makes it effective.
Where FlyteFoam Still Fits
FlyteFoam hasn’t disappeared, but it now sits behind the newer technologies. It’s firmer, more stable, and less dynamic. That makes it useful in certain situations, especially in budget models or shoes designed for support rather than softness. Some people still prefer that grounded feel, particularly if they don’t like overly cushioned shoes. But compared to FF BLAST+, it’s clearly from an earlier generation of design.
Choosing the Right Foam
Most people don’t need to analyze foam chemistry. They just need to match the feel to their use.
If your priority is comfort, impact reduction, or joint relief, FF BLAST+ ECO is the right direction. It’s forgiving and easy to wear for long periods.
If you want one shoe that can handle walking, light running, and general daily use, FF BLAST+ gives you the most versatility.
If you’re training for speed or care about performance gains, FF BLAST+ Turbo is where ASICS puts its energy-return technology.
Everything else is a variation on those three experiences.
ASICS Shoes That Use Each Foam
Once you understand the foams, the shoe lineup starts to make sense. The models below give you a clear starting point depending on what you’re looking for.
FF BLAST+ MAX
- ASICS Novablast 5
- Expect this foam technology on newer ASICS shoes as they are released in 2025 and beyond.
FF BLAST+ ECO (maximum comfort and cushioning)
These are the shoes people gravitate toward when comfort is non-negotiable.
- ASICS GEL-Nimbus 26
- ASICS GEL-Nimbus 27
- ASICS Novablast 4 (uses a more energetic setup with similar cushioning DNA)
FF BLAST+ (balanced daily trainers)
These models are built to handle a mix of walking and running without leaning too far in either direction.
FF BLAST+ Turbo (performance and speed)
This is where ASICS focuses on race-day and fast training.
FlyteFoam (firmer, more traditional feel)
These are typically more structured and often more affordable.
Best ASICS Shoes by Foam Type
Here is a breakdown of which models use which ASICS foam technology.
Model | Foam Type | Best For | Why It Stands Out | Price |
|---|---|---|---|---|
ASICS GEL-Nimbus 27 | FF BLAST+ ECO | Max cushioning, walking, joint relief (see review) | One of the softest, most protective rides in the ASICS lineup. Ideal for long days on your feet. | |
ASICS GEL-Nimbus 26 | FF BLAST+ ECO | Recovery runs, all-day comfort (see review) | Slightly more stable than the 27 with the same plush cushioning feel. | |
ASICS Novablast 5 | FF BLAST MAX | High-cushion daily training, walking + running (see review) | Introduces ASICS’ max-cushion foam with a more energetic, bouncy ride than Nimbus while keeping similar protection | |
ASICS GEL-Cumulus 26 | FF BLAST+ | Daily training, walking + running mix (see review) | Balanced cushioning that works for almost anyone without feeling too soft or too firm. | |
ASICS Novablast 4 | FF BLAST+ ECO (tuned) | Versatile performance and comfort | A slightly firmer, more responsive option than v4, still popular for its versatility. | |
ASICS Metaspeed Sky+ | FF BLAST+ Turbo | Racing, speed training (review) | Built for stride runners looking for maximum propulsion and energy return. | |
ASICS Metaspeed Edge+ | FF BLAST+ Turbo | Cadence runners, race day | Slightly different geometry than Sky+, optimized for quicker turnover runners. | |
ASICS GT-2000 13 | FlyteFoam + FF BLAST+ | Stability, overpronation (see review) | Combines support with modern cushioning, making it a strong option for controlled movement. | |
ASICS Gel-Contend 9 | FlyteFoam | Budget walking, light use | Affordable, durable, and firm. Good for casual wear rather than performance. |
Key Specs Comparison: Weight, Stack Height, and Fit
Looking at specs side by side helps clarify how these shoes will actually feel in use. Weight influences how quickly a shoe feels on foot, stack height affects cushioning and impact absorption, and width options are critical for overall comfort, especially for walkers and people with foot conditions.
Here’s how the leading ASICS models compare.
Model | Weight (Men’s) | Stack Height (Heel / Forefoot) | Drop | Width Options |
|---|---|---|---|---|
ASICS GEL-Nimbus 27 | ~10.6 oz | ~41 mm / 33 mm | 8 mm | Standard, Wide, Extra Wide |
ASICS GEL-Nimbus 26 | ~10.9 oz | ~41.5 mm / 33.5 mm | 8 mm | Standard, Wide, Extra Wide |
ASICS Novablast 5 | ~9.4 oz | ~41.5 mm / 33.5 mm | 8 mm | Standard, Wide |
ASICS Novablast 4 | ~9.2 oz | ~41.5 mm / 33.5 mm | 8 mm | Standard, Wide |
ASICS GEL-Cumulus 26 | ~9.9 oz | ~38.5 mm / 30.5 mm | 8 mm | Standard, Wide |
ASICS Novablast 3 | ~9.1 oz | ~40 mm / 32 mm | 8 mm | Standard, Wide |
ASICS Metaspeed Sky+ | ~7.2 oz | ~39 mm / 34 mm | 5 mm | Standard |
ASICS Metaspeed Edge+ | ~7.4 oz | ~39 mm / 31 mm | 8 mm | Standard |
ASICS GT-2000 13 | ~9.8 oz | ~38 mm / 30 mm | 8 mm | Standard, Wide |
ASICS Gel-Contend 9 | ~10.4 oz | ~32 mm / 22 mm | 10 mm | Standard, Wide |
