Asics Sonic Blast Review: A Firm, Stable Tempo Shoe That Sits in an Awkward Spot

Introduction

A few weeks ago, Asics launched one of the most hyped shoes of the year, the Mega Blast, and alongside it quietly dropped something very different: the Sonic Blast, a new plated speed shoe designed for faster runs. It arrives in a fiercely competitive segment of the market, up against the Nike Zoomfly 6 and Asics’ own Magic Speed 4, so the obvious question is where it actually fits.

This review looks at how the Sonic Blast performs in real running and how it stacks up against those rivals, so you can decide whether it deserves a spot in your rotation.

Asics Sonic Blast Overview

The Sonic Blast is a max-stack tempo speed shoe built for slightly longer efforts: steady runs, marathon pace blocks, and tempo sessions. It could also serve as a more economical race day option for runners who prefer a pebax plastic plate rather than a full-on super stiff carbon plate.

The key numbers: 46 mm of stack height at the heel with an 8 mm drop, and a measured weight of 301 g, which is reasonable for a max-stack shoe at this size. It launched at £170.

The upper is a genuine standout. It uses a well-executed engineered mesh with a good amount of airflow, a nice lightweight tongue with a gusset that holds everything in place, and a heel cup that is not overly padded. The midsole pairs two foams: the new FF Turbo Squared on top, the same ATPU super foam used in the Mega Blast for bounce and soft cushioning, and a layer of FF Blast Max underneath, the foam from the Nova Blast 5, adding stability and durability. A lightweight pebax plate, which Asics calls the Astro plate, adds propulsion and helps stabilize the big stack. The Asics Grip outsole is very grippy, though only one width is available, and most runners should be fine ordering their regular size.

Likes: Comfort, Stability and Build Quality

The Sonic Blast is very comfortable straight out of the box, with the upper working especially well and breathability holding up nicely. The heel cup caused no issues despite being lightly padded, which is typical for a lighter-weight shoe.

Stability is the shoe’s real party trick. There is clear inspiration from the Nova Blast here, and it shows: this is a very, very stable shoe, especially when you pick up the pace. In a category where ankle-rolling anxiety is common in max-stack designs, the Sonic Blast gives you absolutely no fear of that. It is genuinely nice to cruise along at 10K to half marathon pace, and it helps you stick at that pace.

Heavier runners and heel strikers are also well served. Given the stack height and the firmness on offer, heavier runners can extract the most from the midsole, and heel strikers get a very smooth transition through foot strike. Finally, this is simply a well-built, good-looking shoe with strong build quality throughout.

Dislikes: A Firmer, Niche Ride

Out of the box, this is a much firmer ride than you might expect given the foam overlap with the Mega Blast, which is a very soft shoe. The plate and the FF Blast Max layer firm things up considerably, and there is also an aggressive rigid rocker at the front that adds to the overall stiffness. With so many runners preferring softer, bouncier rides these days, that alone will put some people off.

It is also a little clunky at slower paces. Where the Nova Blast excels at easy pace, adding a plate has made the transitions around easy pace more laboured. You will need a separate daily trainer in your rotation to cover those easy runs.

The bigger issue is positioning. The Sonic Blast is not fast enough to be a full-on race shoe, so at best it is a third shoe in a three-shoe rotation. It sits awkwardly between the Nova Blast and the Magic Speed: slightly more poppy than the Nova Blast, but definitely not as fast as the Magic Speed, and both of those are cheaper at £150-£160 territory versus this shoe’s £170. For a lot of people, the Nova Blast handles tempo work just fine, and the Magic Speed handles the faster end.

How It Compares

Against the Mega Blast, these are two very different shoes. The Mega Blast is a max-stack super shoe, non-plated, ideal for long runs and long run sessions, and much lighter, much softer, bouncier, and a lot more fun to run in. It is a contender for running shoe of the year, but it is £40 more expensive at £210. The Sonic Blast is far more niche, aimed at a very specific type of uptempo run.

The Magic Speed 4 is the closest sibling in the range and the comparison raises fair questions about why both exist. The Magic Speed has a carbon plate, feels a lot better at genuinely fast paces like 5K pace, 10K pace, intervals, and thresholds, is slightly lighter and more performance-oriented, but is a little less stable and £10 cheaper. The Sonic Blast, with its pebax plate, feels better on slightly longer efforts: 20-minute tempos and steady runs where you lock into a pace and forget about it. It will be interesting to see whether a future Magic Speed update reshapes this division.

The Nike Zoomfly 6 is arguably the best shoe in this segment and a frequent recommendation, and it edges the Sonic Blast for most people. Both target tempo efforts, but the Zoomfly is more versatile, handling 5K and 10K work as well as longer sustained efforts and long run sessions. Its ride is softer and a lot bouncier, which most runners will prefer, and it is £15 cheaper, though slightly heavier. The Sonic Blast is a lot firmer but notably more stable than the Zoomfly 6.

Who the Sonic Blast Is For

This is a bit of an oddball shoe, and that is not necessarily a bad thing if it matches your needs. If you like having a big rotation with very specific shoes for different run types, it is worth a look for tempo sessions, steady runs, and marathon pace blocks.

It also makes sense if you have tried the Zoomfly and found it a little too unstable or too soft, since the Sonic Blast delivers a more traditional, firmer, planted ride. Heel strikers and heavier runners may genuinely enjoy what it offers. Beyond those groups, though, it is a tough sell, especially at this price point in the mass market, and it has been somewhat overshadowed by the Mega Blast launch, which for many runners is the easier and better purchase.

Buying Advice

If you want a versatile daily trainer, the Nova Blast 5 remains the smarter pick in the Asics range. If you want a dedicated speed shoe, the Magic Speed 4 is faster, lighter, and cheaper. And if you want the most versatile shoe in this plated tempo segment, the Nike Zoomfly 6 is still the one to beat, with a more engaging ride at a lower price.

Buy the Sonic Blast only if you specifically want a firm, very stable max-stack tempo shoe for longer uptempo efforts and you have the room for it as a niche third shoe. Everyone else will likely be better served by the alternatives around it.

Conclusion

The Asics Sonic Blast is beautifully built, impressively stable, and genuinely effective for steady tempo and marathon pace work. But its firm ride, clunky easy pace, and crowded positioning between the Nova Blast 5 and Magic Speed 4 make it a niche proposition at £170. For most runners, the Mega Blast, Nova Blast, Magic Speed 4, or Zoomfly 6 will be the more obvious choice. For the specific runner who wants exactly what it offers, though, it does its job well.