Adidas Prime X2 Strung: Marathon-Distance Impressions

Introduction

Testing a performance running shoe over a full marathon distance tells you far more than any short test run ever can. That was the idea behind taking the Adidas Prime X2 Strung through 42 kilometres at an easy, controlled pace. The shoe has built a strong following already, and this longer test aimed to answer a simple question: how does a shoe this stacked and this heavy actually feel when you are still on your feet hours into a run?

The Race Setting: A Flat, Friendly Marathon

The shoe was tested at a small, flat marathon near Oxfordshire, a race of roughly 1,200 entrants with a very local, low-key feel. It is easy to reach from London and the surrounding areas, entry stays open close to race day, and the flat profile makes it a popular option for runners chasing a personal best.

One thing worth knowing before signing up: about half the course runs on roads that are not fully closed, so you share the route with cars on one side while you run on the other. The marshalling is genuinely excellent, with a large, friendly and safety-focused team out along the entire course, and the atmosphere is surprisingly big for such a small event, with crowds cheering runners by name for much of the route. The start and finish take place on an athletics track, and finishing with a lap of the track while the announcer calls out your name is a genuinely warm touch. Around four miles of the course is run twice as a loop, though it is barely noticeable the second time around.

On-the-Road Performance

The first thing you notice about the Prime X2 Strung is the weight. It is noticeably heavier than most super shoes when you pick it up, and that impression does not disappear entirely on the run. What impressed most, though, is how little that weight matters at steady paces. The combination of the carbon plate and the thick midsole foam largely overrides the heft, creating a propulsive, forward-tipping ride that makes holding a consistent cruising pace feel effortless.

At paces around 5:00 to 5:30 per kilometre, the shoe felt excellent across the full marathon. There was never a moment where it felt like a burden, and speeding up to change pace or surge briefly felt natural and controlled, as if the shoe had more speed in reserve. It is not the most explosive or bouncy-feeling performance shoe available, and at genuinely fast paces the weight would likely become noticeable, but as a cruising shoe it is hard to fault.

Comfort and Fit

Comfort is where this generation makes its biggest leap. The original Prime X Strung had a wobbly, unstable ride and caused serious heel rub, which made it hard to recommend for long runs. The Prime X2 Strung fixes both problems. There was no heel irritation, no pain, and no sense of restriction at any point across the entire marathon distance, and the ride felt substantially more stable than its predecessor.

That stability and comfort make it an easy shoe to live with over long distances. For tempo work in training, including long sessions of up to 15 miles at marathon pace, it performed consistently well, which is arguably its most convincing use case.

Who Should Buy It

The sweet spot for this shoe is roughly half marathon to marathon distance, and specifically as a training shoe rather than a race-day option. It is not legal for competition for elites and competitive athletes because of its stack height, and for most everyday runners it also feels a touch clunky and overbuilt for actually racing. If you want a lighter race-day option, something in the lighter super shoe category will serve you better.

Where it genuinely earns its place is long-distance training and comfortably-paced marathons. If your goal is to hold a nice, consistent pace over big miles, with the option to pick the speed up whenever you feel like it, this is a very good shoe for the job.

Conclusion

The Adidas Prime X2 Strung is a much better shoe than the original Prime X Strung in almost every way that matters for long runs: more stable, more comfortable, and free of the heel rub issues that plagued its predecessor. It is heavier than a dedicated racer and not a shoe you would pick for a fast race day, but as a propulsive, cushioned companion for marathon-paced training and relaxed long-distance running, it is an easy recommendation.