Adidas Adizero Prime X: A 100-Mile Review of a Super Shoe That Keeps Getting Better

Introduction

Some running shoes are best judged on day one. Others need real mileage before they show their true character. After 100 miles, or about 161 kilometers, the Adidas Adizero Prime X belongs firmly in the second category. Used across paces ranging from easy efforts at around 8:15 per mile to faster tempo work near 6:45 per mile, this shoe has not just held up. It has got better.

Our pair weighed roughly 304 grams, or 10.7 ounces, in a UK size 11, with a 56 millimeter stack height in the heel and about 46 millimeters in the forefoot. Those are imposing numbers on paper, but over 100 miles they translated into one of the most comfortable and consistently enjoyable rides we have put miles into recently.

Who This Shoe Is For

The Prime X is aimed at road runners who want maximum cushioning for longer runs, easy miles, and harder efforts alike. It works well on flat, even surfaces where its tall, propulsive platform can be used without demanding constant balance work.

It is worth being upfront: this shoe is not for everybody. Runners who prefer a plush, heavily padded upper may find it too minimal, and the unconventional design choices take some adjustment. It is also not an off-road shoe, and it is not legal for elite athletes competing under World Athletics rules in championship races. For everyone else, it is a very capable road option for half or full marathon training.

Upper: Refined, Unconventional, and Comfortable

The upper is somewhat unconventional, but it works. The refined mesh is excellent, and lockdown is exceptional, which matters given the unusual tongue structure that takes a little getting used to. Some runners may feel the design crosses a line into too experimental, but the payoff is real.

Lace pressure across the top of the foot was essentially non-existent, and the shoe was a genuine pleasure to slip into. Fit was true to size with no need to size up. After 100 miles in wet and dirty conditions, there was no wear or tear on the upper at all. The lack of a conventional heel collar caused no issues either, and the upper would comfortably support use in a full marathon.

Midsole: A Ride That Improves With Mileage

This is where the Prime X earns its reputation. The Lightstrike Pro foam frees up the more you use it, gaining a bit more give, squash, and bounce than when it first came out of the box. The combination of foams, carbon blades, plates, and energy rods produces a ride that is cushioned, compressive, and yet propulsive, especially at speed.

Over longer runs, the midsole saves the legs and keeps you fresher while still delivering strong toe-off. Nothing else on the market we can think of offers this level of forgiving feel underfoot. Even other top-tier super shoes can feel more aggressive or firmer in the forefoot by comparison. The Prime X never felt unstable on even camber, though you cannot run carefree around corners or quick double-backs without paying attention. Watch your ankles on tight bends.

On climbs, the energy rods seem to work particularly well, making hill running noticeably more assistive. Reports of ankle strain from other runners have not matched our experience at all. After 100 miles, the ankles feel great.

Outsole: Zero Wear, Immense Grip

The outsole is the easiest section to praise. After 100 miles there is zero wear on the rubber. Nothing. This is one of the best shoes tested for grip and traction in years, and the multi-directional rubber pattern on the mid-to-forefoot encourages a forefoot to midfoot landing that works with the rest of the shoe.

The only cosmetic note is a tiny bit of exposed midsole discoloration, which is nothing to worry about. In pretty much any weather, on most surfaces, this is a superbly executed design that takes the best elements of Adidas’ current top-line running shoes and combines them into one package.

Value: A Long-Term Investment

Value is where the Prime X quietly wins. Yes, it is a very expensive shoe, though notably cheaper than some of its closest premium rivals. The crucial difference is durability: many premium super shoes deteriorate in performance over time, while this one keeps getting better.

It proved usable for easy sessions, long runs, and harder efforts alike. Every run in it ended with a smile, and that counts for a lot at this price point. If you have decent form and some nice flat roads, you will get your money’s worth.

Buying Advice

Consider the Adidas Adizero Prime X if you want a max-cushion, carbon-assisted road shoe for half or full marathon training, long runs, and daily mileage, and you mostly run on even, predictable surfaces. Be prepared for an unconventional upper and an enormous stack height, both of which take a short adjustment period. Skip it if you run mostly off-road, race in elite championship competition, or simply prefer a traditional, plush-fitting trainer.

Conclusion

After 100 miles, the Adidas Adizero Prime X scores 11.5 out of 12 across upper, midsole, outsole, and value. It is comfortable, fast, fantastically grippy, and unlike most shoes in its class, it improves with every mile. It is not a shoe for every runner, but for those it fits, it is something special.