May has become the busiest super-shoe launch window in the running calendar, and 2026 is no exception. Between this week and the end of the month four major brands will move new carbon-plated product into wide release, with another two pushing prototype hardware out for athlete-only testing. Three launches dominate the conversation: Hoka's revised Skyward X 2 on 15 May, Nike's wider rollout of the Vaporfly 4, and On's punchy £200 Cloudboom Volt. Each tells a slightly different story about where the high-end road category has settled after London 2026 and the Adidas Adios Pro Evo 3.
The Hoka Skyward X 2 launches on 15 May at £225 / $225, sitting in the brand's super-trainer slot rather than the racing slot of the Rocket X family. The headline change is mass: Hoka has shaved roughly 25 grams from the original by paring back stack height and reworking the carbon plate's curvature, while keeping the dual-density PEBA-over-EVA midsole that defined the first generation. The Skyward X 2 is being marketed at heavier-build runners and back-of-pack marathoners who valued the original's protection but were put off by its weight. Early multi-tester reviews from Believe in the Run and Road Trail Run both flag the redesigned plate as a meaningful upgrade in tempo work, with no tester preferring the original.
Nike's Vaporfly 4 has been on the elite race circuit since the autumn but moves to genuine wide release on 23 May, sitting at $260 globally. The most visible change versus the Vaporfly 3 is mass: at 175 grams in a US 9 the new shoe is among the lightest in its class, just shy of the 97-gram Adidas Adios Pro Evo 3 that grabbed all of London's headlines. Nike has stuck with a single full-length carbon plate but introduced a slimmer ZoomX block under the heel, citing the change as a response to ongoing concern about super-shoe-related bone-stress injury risk. Distribution is staggered, with Asia and the United States first; UK on-shelf is 30 May.
On's Cloudboom Volt is the most aggressively priced launch of the spring, listing at £200 / $220. The Swiss brand has pitched the Volt as a "racer's daily racer," a clear positioning shift after the Cloudboom Strike series proved less popular than the brand's lifestyle Cloudmonster line. The Volt uses a Pebax-blended midsole and a Speedboard-style plate rather than full carbon, which keeps the price low and the durability targets up. The early consensus from review media is that the Volt is the most versatile of the May launches, even if it doesn't match the rebound of the Vaporfly or the protection of the Skyward.
Two further drops sit on the edge of the wide-release category. Saucony's Endorphin Elite 3 is shipping to early-access subscribers from 21 May with broader retail planned for June, and adidas has confirmed that the Adios Pro Evo 3 will get a second drop window in late autumn after the StockX resale market took the original London-week stock to four-figure prices. The Pro Evo's carbon-plate-and-Lightstrike Pro architecture has not been altered, but adidas has signalled that the supply will roughly double versus the launch window, which should slow the resale froth without changing the racing landscape. Combined with the Hoka, Nike and On launches, May 2026 will end with more genuinely current super-shoe SKUs in retail at once than at any point in the category's short history.