🥚 A medium egg in Japan weighs 58 to 64 grams in its shell. Mizuno's new racing shoe weighs about 96 grams, so two eggs outweigh it. Yet the Hyperwarp 96 has a thick foam sole and a carbon plate, the same recipe as the shoe that carried the first sub-two-hour marathon in London in April 2026.

Lighter than two eggs, thicker than it looks

Mizuno announced the Hyperwarp 96 on September 24, 2026. The name is the weight: about 96 grams for one shoe in size 27.0 cm, a men's US 9.

The sole is what makes that number odd. The stack height, the thickness of material between foot and road, is 39.0 mm at the heel and 36.0 mm at the forefoot, a 3 mm drop (the heel-to-toe height difference), with a full-length carbon plate inside. Foam and plates normally add weight. The Hyperwarp Pure, the lightest model in Mizuno's Hyperwarp series until now, went on sale on December 19, 2025, at about 137 grams. The new shoe is 41 grams lighter.

Mizuno got there with a machine-carved midsole foam called Mizuno Enerzy XP+ Limited Edition, a plate that Tom's Guide says is hollowed out beneath the heel, and a laceless upper made of sprayed TPU fibers.

Only 696 pairs will be made, the "96" hidden in the count. As of September 2026, Mizuno plans to sell them from December 4, 2026, through its online store and its own shops, with selected running retailers following from January 2027. The price in Japan is 88,000 yen (about $557) including tax. The shoe is approved by World Athletics for competition.

Why thick soles got fast

"Super shoe" is the running world's name for this formula: a thick layer of soft, springy foam plus one stiff plate. The foam squashes on landing and returns much of that energy, while the plate stiffens the shoe and helps roll the foot forward.

A study published in Sports Medicine in 2018 found that runners in a Nike prototype used 4% less energy, on average, than in established racing shoes. The paper discloses that two co-authors were Nike employees and another was a paid Nike consultant. It also shows how uneven the effect was: across 18 runners, savings ranged from about 1.6% to 6.3%. A lab average is not a promise for any particular pair of legs.

World Athletics stepped in on January 31, 2020, limiting road racing shoes to a sole no thicker than 40 mm and no more than one rigid plate.

A rulebook that froze the thickness

With thickness capped, the obvious dial left to turn is mass. Adidas's Adizero Adios Pro Evo 3 measures 39 mm at the heel and 36 mm at the forefoot with a 3 mm drop, exactly the same as the Hyperwarp 96, as Tom's Guide pointed out. Two rival companies landed on identical geometry just under the 40 mm limit. They differ in structure: the Evo 3 swaps the full plate for a carbon rim, the Asics Metaspeed Ray (announced in May 2025, about 129 grams) has a plate only under the forefoot, and Mizuno kept a full-length plate with the heel hollowed out.

Adidas's shoe came first. It was shown at the Tokyo Marathon Expo in February 2026 and went on sale on April 23, 2026, at 97 grams on average in size 27.0 cm, 41 grams less than the 138-gram Evo 2. Adidas says running economy (how little energy it takes to hold a given pace) improved by 1.6%. Three days after the launch, on April 26, 2026, Sabastian Sawe of Kenya won London in it in 1:59:30. Nobody had broken two hours before in a race that counts for records.

It is too early to say the contest has moved from bounce to weight for good, since brands still change foams every season. For now, though, the headlines are being won in grams.

What one gram is worth

WWDJAPAN called the Hyperwarp 96 the lightest running shoe on sale. Mizuno's own release says only that it is the lightest in the series. The margin over Adidas is 1 gram, and the two companies don't even state weight the same way: "about 96 grams" versus "97 grams on average." One gram fits inside the wiggle room of those words.

A 2016 study in Medicine & Science in Sports & Exercise found that adding 100 grams to each shoe raised energy cost by 1.11% and slowed 3,000 m times by 0.78%. Scaled down, one gram is roughly 0.01%, too small for a runner to feel or for a race clock to separate from an ordinary good or bad day.

By the same rough rule, the 41 grams Mizuno cut from its own Pure come to about 0.46%, which does matter. The catch is that the rule assumes everything else is equal, and a new foam, plate and upper are not.

What you give up for 96 grams

Less weight means less material, and material is what makes a shoe last. According to Gizmodo Japan, Mizuno put the running life at about 100 km at the launch event, and WWDJAPAN reports that the shoe passed a 100 km durability test. That is about 2.4 marathons.

At 88,000 yen, it works out to roughly 880 yen (about $5.57) per kilometer. The Hyperwarp Pure launched at 35,200 yen (about $223). The WWDJAPAN writer who tried the 96 on saw it as a pair for race day, not daily training.

No independent data yet shows whether this particular shoe makes anyone faster. Mizuno says it combines cushioning, bounce and stability, and for now that is the maker's claim.

Where Japan's brands stand

Japan's informal scoreboard for running shoes is the Hakone Ekiden, a university relay run every New Year between Tokyo and Hakone, where every runner's shoes get counted. In the 2026 race, according to a count by the retailer Alpen Group published by Number Web, Adidas came first with 75 runners (35.7%). Asics had 60 (28.5%), Nike 35 (16.7%) and Puma 31 (14.8%). Mizuno had 2 runners, or 1.0%.

At Hakone, then, the brand behind this shoe is a small player. Asics is the Japanese company in the fight, and a 696-pair concept model won't change that. Mizuno says what it learned will go into future Hyperwarp models, and the regular series launched with a domestic target of 10,000 pairs in its first year. The 96 reads as a showcase, not as a sign that Japan has retaken the super shoe race.

Where you run, which brand crowds the start line of the local marathon?

References