Adidas Prime X3 Strung Long-Term Review: A Max-Cushion Trainer That Needs Miles to Shine

Introduction

The Adidas Prime X3 Strung sits at the top of the brand’s max-cushion range, packing practically everything the company has: Energy Rods 2.0, multiple versions of Lightstrike Pro foam, a special hollowed-out plate in the heel, and a striking woven Strung upper. The big question is whether it justifies the very steep asking price of around £250.

After roughly 100 km of testing, the answer has changed over time. Out of the box, this shoe felt firm, dense, and short on energy return, and the energy rods were impossible to feel. With break-in miles, though, it has softened up, the forefoot has come alive, and it has grown into a genuinely enjoyable long-run trainer. If you pick this shoe up, do not judge it on the first few outings.

Who This Shoe Is For

This is a training tool, not a race shoe. It is simply too heavy for racing, and the tester found no realistic scenario where it lines up on a start line. Instead, it earns its keep on long runs with mixed paces, where you might start with a warm-up and then move into race-pace efforts. Despite the mass, it is surprisingly swift when cadence rises, and the very aggressive rocker helps drive turnover.

It also works well as a recovery shoe for tired legs after a grueling race or hard session. The considerable surface area and improved stability compared with earlier versions mean it forgives drifting form late in long runs. Runners who found the original Prime X Strung unstable in the heel, to the point of only wanting to run in straight lines, will find this version far more settled, closer in character to the V2.

Main Strengths

The upper is a genuine highlight. It is very containing and, bizarrely for how it looks and feels in hand, highly breathable thanks to ventilation holes all over the shoe. It worked well in warm summer conditions and remains comfortable in slightly colder temperatures. The Strung upper does most of the actual lockdown work, with the laces acting almost as a finishing touch, and there was never a need to stop and retighten during runs. Fit is more true to size than the V1 and far less bulky or strange on foot than the V2.

Durability has been excellent over testing. The gray area of the outsole extends well beyond the obvious Continental rubber patch, with minimal wear aside from some pattern softening in the forefoot. Grit, stones, and acorn shells on debris-strewn routes caused no damage to the plates or rods, and debris does not get trapped in the outsole cutouts. The shoe is also reasonably easy to clean, with few openings where moisture can get into the midsole.

Things to Consider Before Buying

The price is impossible to ignore. At £250, and even at the discounted £225 the tester paid, this is a serious investment for a shoe that is strictly for training. Max-cushion shoes with big stack heights do not work for everyone either; some runners find that much compression hard on the knees, and anyone who prefers road feel should think carefully.

There is also the break-in issue. The midsole needs miles to soften, the forefoot only becomes compressive and engaging after extended use, and the shoe can feel disappointing in early outings. Stability is much improved over the V1 but this is still not the most stable shoe ever made. Finally, the weight: the tester feels the shoe could lose a few grams, and future versions may use softer Evo material to get back closer to the nimble nature of the original.

Buying Advice

If you already run in Adidas shoes, you are probably used to giving their models break-in time, and that mindset applies here more than ever. Do not judge the Prime X3 Strung straight out of the box. Once broken in, it is a versatile, workable option for long runs, mixed-pace sessions, and recovery days, backed by some of the most advanced midsole tech Adidas currently offers.

If you can find it at a discount, the value equation improves meaningfully. If you want a nimble, exciting shoe for racing or fast days, look elsewhere. This one is built for the long haul.

Conclusion

The Adidas Prime X3 Strung starts out underwhelming and gradually wins you over. The foam softens, the forefoot engages, the upper proves both containing and breathable, and the outsole holds up impressively well. It is less flamboyant than the V1 and more usable, even if it still carries a hefty price and a few grams too many. For runners who want a max-cushion trainer for long, mixed-pace miles, it is worth a close look, provided you have the patience for the break-in period.