In this in-depth, long-term review of the ASICS Megablast, we move beyond first impressions to examine how the shoe has held up after 400+ miles of marathon training. The verdict? Where most shoes would be knocking on the door of retirement at this mileage, the Megablast feels almost identical to how it performed out the box. While early reviews rightly celebrated its fun, bouncy ride, our long-term testing reveals just how much more this shoe has to offer — remarkable durability and an unrivalled consistency throughout its lifespan. Could this be the new king of the super trainers?

Technical Specifications

Stack Height: 46/38mm
Heel-to-Toe Drop: 8mm
Plate: No
Midsole Foam: FF Turbo²
Weight: 230g (UK 8)

Most modern super trainers feel impressive for the first 100 miles. Some hold on through 250. Very few still feel genuinely fresh past 400. 

“Hold my beer!”, say the ASICS Megablast, because after 401.4 miles — a combination of easy runs, long runs, tempo sessions, and even interval work — this shoe has maintained its character in a way that makes it one of the most durable high-performance trainers I’ve ever worn.

Testing Conditions

I’ve tested the Megablast across all types of runs: recovery, easy, tempo, intervals, steady long runs, and long runs with target pace blocks. My favourite use-case has been a real mix. Steady easy runs over 7 miles, tempo runs, and long runs, both steady and structured.

Fit & Sizing

I typically wear a men’s US 11 / EU 45 / UK 10, and find the Megablast fits true to size. Fit has been consistent throughout testing.

• Adequate toe length
• Generous lateral forefoot space
• Secure midfoot lockdown
• No heel slip

Early on, the toe box felt slightly shallow vertically. This became less noticeable as the miles ticked away, possibly due to the insole conforming to my foot.

The upper is lightweight and breathable, with a performance-oriented feel. Compared to ASICS’ Superblast or Novablast uppers, it is less plush and slightly less forgiving. It performs well but does not stand out as the strongest element of the shoe.

One minor note: the upper tends to flare near the last eyelet, which may allow some debris to enter on packed dirt surfaces.

Durability & Consistency – The Real Story After 400+ Miles

Beyond the features you may already have heard about the Megablast — its bounce, light weight, versatility, and overall fun ride — there are two main aspects that early launch reviews were unable to capture: durability and consistency of midsole feel (and performance more broadly) throughout the shoe’s lifespan.

To really put into perspective how well the Megablast have held up over these 400+ miles, the only noticeable wear is cosmetic. Specifically, patches of paint peeling on the sidewalls. As I frequently run down by the beach (editor’s note: we, here in the UK, are definitely not the slightest bit jealous of Paulo’s local run), this is likely due to repeated exposure to salty air. The foam underneath remains structurally intact.

As for the Megablast’s performance and midsole feel, it took approximately 40 miles to fully break them in. During that period, the midsole softened slightly and became more fluid under load. After that, they stabilised.

Now, at 401.4 miles:

• Cushioning still feels protective
• Energy return still noticeably present
• Stability has not degraded
• Outsole wear is minimal

In contrast, another ASICS super trainer, the Superblast 2, experienced a small but noticeable performance drop shortly after 300 miles. Protection and stability are still there, but the subtle liveliness that once encouraged a slightly quicker rhythm has faded. The Megablast has not shown that drop. The midsole still provides the same small but tangible forward encouragement it had earlier in its life cycle.

If you’re deciding between the two, it is worth discussing what this slight performance drop means. We are referring to the extra 1% boost you get when a shoe is freshly broken in. In a race shoe, that margin can make the difference between getting a new PB. However, in a training shoe like the Superblast 2 or the Megablast, I would not recommend using peak performance retention as the primary deciding factor. It might, however, serve as a tie breaker once other factors have already been considered.

Even at 421 miles, the Superblast 2 still feels like it has plenty of life left. I suspect I may reach around 600 miles in both shoes, but only time will tell.

A-TPU as a compound deserves serious credit. It resists compression set in a way that feels meaningfully different from EVA and even PEBA blends over long mileage.

The recently released Superblast 3 now uses FF Leap, which, like the FF Turbo² of the Megablast, is also an A-TPU foam (only tuned slightly softer). Based on my experience with the Megablast, I am optimistic about long-term performance retention in that shoe as well.

Midsole – Controlled Energy

The Megablast uses a single layer of FF Turbo², an A-TPU formulation tuned slightly firmer than FF Leap.

On the run, the foam behaves dynamically:

• At easy paces, it feels soft and protective
• As pace increases, it firms slightly and becomes more responsive
• It avoids the overly marshmallow sensation some max stack shoes develop

There is a consistent sense that the shoe wants to move. Even during longer efforts, when fatigue typically dulls leg turnover, the midsole maintains a subtle energy that keeps stride mechanics feeling efficient.

One important distinction: this is an outstanding easy-day shoe, but not necessarily an ideal recovery shoe. For me, easy runs refer to those completed in Zone 2, while recovery runs vary from Zone 1 to very low Zone 2. The Megablast tends to encourage movement. On true recovery days, that encouragement can feel counterproductive when the goal is to stay deliberately slow.

Stability – A Misunderstood Category

In practice, the Megablast performs better than static testing suggests.

If you stand in the shoe and deliberately rock the heel, it can feel compliant. Under actual running load, the foam firms and stabilises. The medial geometry provides subtle guidance without feeling corrective.

A-TPU reacts differently to force than traditional EVA or PEBA foams. Evaluating stability while standing still does not translate directly to how the shoe behaves at pace. The Megablast is not a super soft shoe. While it’s plush and cushioned, at pace the midsole firms to become responsive. In static testing it may feel slightly unstable, but once force is applied to the midsole, stability becomes very noticeable, even at slower paces around 10:00 per mile or slower. You do not need to be running sub-3-hour marathons for your easy pace to be fast enough to benefit from the stability of this shoe.

Geometry also contributes to stability. The medial side of the midsole subtly bulges outward while the lateral side subtly tapers inward. Combined with a wider base, the shoe helps prevent excessive inward collapse during the gait cycle.

Using the Superblast 2 as a reference, I suspect the marginal support difference between the two shoes comes primarily from the outer midsole wall that creates a heel cockpit in the Superblast 2 rather than from foam compliance.

I would classify the Megablast as a stable neutral trainer. Heel-dominant runners who are sensitive to high rear stack height may experience it differently. As a midfoot striker, I found it secure at both easy and moderate paces.

Outsole and Traction

Grip has been consistently reliable.

Dry pavement, heavy rain, polished concrete, and wooden decking have not presented issues. Even near coastal routes with sand and salt exposure, the outsole shows minimal wear.

On rainy days, the Megablast is one of my preferred options because of the confidence it provides. Some of the most challenging wet surfaces along my usual route are very smooth polished concrete sections and wooden bridge decking. On the run where I crossed the 400-mile mark, those surfaces were properly wet and the Megablast handled them well.

At 401.4 miles, the outsole still appears structurally sound and looks similar to how it did around 40 miles.

Where It Fits in My Rotation

The Megablast, being a super trainer, handles a variety of paces and run types well. After 400+ miles, and with a deeper understanding of the shoe, I plan to continue to use the Megablast for tempo runs and long runs, particularly structured long runs with target pace blocks.

There’s no doubt that the Megablast can handle easy runs well, and with discipline it may also work for recovery sessions. However, given the other options in my rotation, especially the recent addition of the Superblast 3, I plan to use the Megablast more selectively.

The Megablast is a brilliant running shoe and perhaps dethrones its sibling, the Superblast, as the ‘king of super trainers.’ It’s so good that I already have a second pair in the beautiful Ekiden green colourway waiting for this one’s eventual retirement. How long they will have to wait for their maiden voyage is a mystery, as at a smidge over 400 miles, this pair of ASICS Megablasts are showing no signs of letting up.

Price & Value

Only in the current climate could a £210 running shoe feel like equal parts extravagance and excellent value. It might sound ridiculous, but with single-use super shoes like the Adizero Pro Evo 2 — okay, “single-use” is a touch facetious — setting you back £450, and more brands seemingly committed to testing just how far they can push pricing before consumers push back, the fun and indubitably durable ASICS Megablast starts to feel, in some respects, like an absolute steal.

When it comes to running shoe costs, most people focus on the initial outlay — and understandably so. For many, it simply comes down to “what can I afford?” But cost is better evaluated over a shoe’s lifespan: how much does it cost per mile? A £120 trainer that lasts half the mileage of a £210 one is, at the end of the day, the more expensive option.

The ASICS Megablast has us thinking not just about the sheer quantity of miles, but the quality of them. It’s easy enough to stretch the life of a shoe, but this typically comes at the expense of comfort, performance, or protection — often all three. What makes the Megablast unique is that it delivers the same experience at mile 400 as it does at mile 40.

If you’re in a position to absorb the Megablast’s upfront cost, its price per mile works out considerably lower than many seemingly “cheaper” alternatives. Factor in the quality of those miles — particularly the later ones — and the ASICS Megablast represents genuinely strong value.

And one more thing: subscribers to the Gritty Runners mailing list receive a 15% discount code for SportsShoes every month. As the Megablast is currently part of the SS26 collection, that brings the price down to a very manageable £178.49. Subscribe mid-month? Just drop us an email and we’ll send the code straight over.

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Paulo Quindere Saraiva