Hoka Skyward X vs Adidas Prime X 2.0 Strung: Which Max-Stack Super Trainer Fits Your Running?

Introduction

Max-stack super trainers are a strange breed: huge stacks of foam, plates inside, and a ride that can feel equal parts fun and unsettling. Two of the most talked-about options right now are the Hoka Skyward X and the Adidas Prime X 2.0 Strung. If you have been weighing up whether to go for the Hoka or the Adidas, this comparison breaks down the key stats, the fit, the ride, and ultimately which shoe suits which kind of runner.

Skyward X vs Prime X 2.0 Strung: The Tale of the Tape

On paper, the Adidas Prime X 2.0 Strung is the more expensive of the two in both the UK and the US, by a considerable amount. The Prime X is also the lighter shoe, though only by a few grams. The Hoka has the higher drop and a bigger stack height at both heel and forefoot, breaching the World Athletics approved stack height for elite racing.

The uppers differ noticeably. Hoka uses a flat knit mesh, while Adidas uses its Strung material for a much thinner, bootie-style upper. In the midsole, Hoka employs a dual-density setup of PEBA and EVA foams with a carbon plate sandwiched in the middle. The Prime X counters with three layers of Adidas’s Lightstrike Pro foam and two carbon fiber plates. For outsoles, Adidas opts for Continental rubber while Hoka uses its own abrasion-resistant rubber, with Hoka offering a bit more rubber coverage in key zones to boost durability.

Fit and Sizing

Both testers recommend sticking to your normal running shoe size in both models. The Skyward X has the more accommodating fit overall: good room up front in the toe box, a secure hold around the heel and midfoot, more padding in the heel collar and tongue, and a comfort edge to the whole package. The higher heel tab at the back raised mild Achilles irritation concerns for one tester, though nothing significant surfaced during testing.

The Prime X 2.0 Strung is fussier but still a good fit. It is snugger and tighter with a racing-style bootie feel, and the minimal heel collar can cause some initial heel rub that requires playing with the lacing to lock down properly. Once on, it is dialed in and holds nicely, which matters when you push the pace in a shoe with this much soft foam underneath.

If you like a roomier toe box, the Skyward X gives you more clearance. If you want a race-like, locked-in upper, the Adidas is the more precise of the two. High insteps may find the Prime X a real struggle to wrestle on, even though it is comfortable once secured.

Ride and Running Experience

Both shoes are genuinely fun to run in, but for different reasons. The Skyward X is geared toward easy running and cruising through long runs. Its wider base makes it noticeably more stable and grounded than the Prime X, especially for heel strikers, and it often produced faster-than-expected paces for the effort level on long runs. It is plush without feeling overly plush, with a lively ride from the dual-foam and plate combination, but it is not the shoe you reach for at all-out speed. At faster paces it can feel ponderous and occasionally sinky.

The Prime X 2.0 Strung comes alive when you run quickly. It is springier, feels lighter on the foot than its weight suggests thanks to the thin Strung upper, and has a pronounced rocker that rolls you through stride and pings you off the foam. Ease off the pace, though, and it feels awkward and less stable, and the soft, wobbly Lightstrike Pro foam can let your foot roll inward slightly. It is not a great shoe in corners and works best on straight, flat roads. With roughly 85k of testing including a hard mile-repeat session, one tester found it fun and versatile but just a bit too big for the very fastest work.

In a side-by-side run with one shoe on each foot, the differences sharpened: the Adidas feels more immediate and aggressive, the Hoka softer with a slower foam response but more protection in the heel. Outsole durability should favour the Skyward X slightly, given its extra rubber coverage, while traction proved fine in the mostly dry conditions of testing.

Buying Advice: Which One Should You Pick?

If you want a max-stack super trainer you can run faster in, the Adidas Prime X 2.0 Strung is the pick. It is the more speed-focused shoe, one that could even carry you to a marathon PB on the right day, though it is not race-legal and it carries a bigger price tag than the Skyward X. Some testers also preferred the first-generation Strung, so if you can find that for cheaper it may be worth considering instead.

If you want comfort, protection, stability and a shoe better suited to longer easy runs, the Hoka Skyward X is the more practical choice. It is also the cheaper of the two. Its extra stability is welcome on broken pavements and cambered roads, and it is the shoe testers said they returned to more often after initial testing, despite the Skyward X’s occasionally inconsistent, wobbly ride. As a rough split: the Prime X 2.0 Strung for speed and bounce, the Skyward X for relaxed daily and long-run duty.

Conclusion

These are two very different takes on the max-cushion super trainer. The Prime X 2.0 Strung is the faster, bouncier, more aggressive shoe, best for fast long runs, tempo sessions and even racing if you accept its quirks and price. The Skyward X is the more controlled, stable and comfortable daily trainer that happily absorbs easy miles and long runs. Both bring serious fun factor and serious price tags, so the honest answer is that the right choice depends entirely on how you actually plan to run in them.