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Hot New Release! Unveiling the Hidden Potential of the ASICS "YOGIRI SPEED"
In 2023, ASICS introduced the "S4," a shoe specifically designed for runners aiming to complete a full marathon in sub-4 (under 4 hours). The name "S4" stands for "Speed," "Stability," "Safety," and "Sub4."
An updated version, the "S4+ YOGIRI," was released in 2024. The product name "YOGIRI" embodied the wish for runners wearing it to break the 4-hour mark.
So, what kind of shoe is the YOGIRI SPEED, which inherits the DNA of the "S4+ YOGIRI"?
Enhanced Lightness and Stability: Aiming for a Sub-4 More Comfortably
Sub-4 is a key target time set by many recreational runners tackling a full marathon. Achieving it requires maintaining a pace of roughly 5 minutes and 40 seconds per kilometer. The YOGIRI SPEED was designed specifically to help runners consistently maintain that pace all the way into the late stages of the race."One of the major update points this time is lightness. It is about 13g lighter compared to the previous model, with a shoe weight of approximately 227g (single shoe, 27.0 cm). By incorporating FF LEAP—which offers exceptional lightness, cushioning, and responsiveness—into the upper part of the midsole, we achieved a lighter shoe.
Another major update point is the enhancement of stability. By widening the bottom width from the midfoot to the heel, greater stability is achieved upon landing. In addition, connecting the rubber on the inner side of the midfoot outsole helps suppress overpronation (the running behavior where the heel excessively rolls inward upon landing)," says Michifumi Takahashi, Product Planner at ASICS Japan Corporation.
The midsole of the YOGIRI SPEED features a two-layer structure. While the previous model adopted FF TURBO PLUS for the upper midsole layer and FLYTEFOAM for the lower layer, this model uses FF LEAP for the upper layer and FF BLAST PLUS for the lower layer. By balancing cushioning and responsiveness, it reduces the burden on the legs even in the latter half of a marathon while supporting smooth footwork.
Redesigned Carbon Plate Shape
Like the previous model, the YOGIRI SPEED features a full-length carbon plate, but its shape has been redesigned."A lightweight carbon plate is embedded inside the midsole to stabilize foot movement and efficiently propel the body forward. Since some runners voiced that the plate in the previous model felt a bit stiff, we modified the heel section into a split-fork shape for this model to provide a flexible and soft ride."
The total sole thickness is approximately 39.5 mm at the heel and 34.5 mm at the forefoot, with a drop (height difference between heel and forefoot) of 5 mm. The upper features engineered mesh with varying knit patterns and hole sizes depending on the area to improve breathability and fit. This keeps the environment inside the shoe comfortable even during long runs.
What Kind of Shoe Is a "Sub-4" Support Shoe?
As mentioned earlier, the "YOGIRI SPEED" was developed to support runners aiming for a sub-4 marathon finish. While it is also a racing shoe, it occupies a different position from ASICS' top racing models, the "METASPEED SKY TOKYO" and "METASPEED EDGE TOKYO."Recently, ASICS has significantly expanded its running shoe lineup, offering a wide variety even when looking strictly at plate-equipped models. Beyond the previously mentioned "METASPEED" series, there is also a carbon plate-equipped shoe called the "MAGIC SPEED 5."
Like the "YOGIRI SPEED," the midsole of the "MAGIC SPEED 5" features FF LEAP in the upper layer and FF BLAST PLUS in the lower layer. The overall sole thickness is approximately 37.5 mm at the heel and 30.5 mm at the forefoot. Looking solely at the specs, it gives the impression of being quite similar to the "YOGIRI SPEED," but the ride feel is noticeably different.
"In terms of feel, I think runners will experience greater stability with the YOGIRI SPEED, while the MAGIC SPEED 5 offers a higher sense of control. Additionally, the MAGIC SPEED 5 is even lighter, weighing approximately 196 g (single shoe, 27.0 cm). For runners seeking more ground feel and lightness, the MAGIC SPEED 5 is likely better suited.
The YOGIRI SPEED, on the other hand, is a model focused specifically on the full marathon distance, developed by listening closely to the voices and needs of runners aiming around the sub-4 mark. For runners aiming for a sub-4 finish, we would love for them to wear the YOGIRI SPEED on race day.
Also, if you plan to use them for training by running shorter distances at faster paces, the MAGIC SPEED 5 will often be the better choice."
Running in the "YOGIRI SPEED" firsthand, it genuinely felt effortless to maintain a sub-4 marathon pace without overexerting myself. Thanks to the moderately wide sole platform and the lower-layer FF BLAST PLUS midsole, it provides ample stability from footstrike to toe-off. Without excessive sink-in, you can move forward with a smooth, rhythmic stride.
In my personal impression, it offers a more "automatic" ride than the "MAGIC SPEED 5," making it well-suited for running long distances at a consistent pace. If you are a runner taking on the sub-4 challenge this season, I highly encourage you to give them a try.
PROFILE
Michifumi Takahashi
ASICS Japan Corp. Performance Running Footwear & Apparel Dept., FW Planning & MD Team
In charge of merchandising for the speed silo, including the METASPEED series. Member of the track and field team through middle school, high school, and university, serving as team manager during university. Guided by the motto "experience it firsthand," resumed running in January after taking on this role. Will challenge a full marathon for the first time in 15 years this autumn.
Text by Fumihito Kouzu
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