ASICS Metaspeed Sky Tokyo Edition: First Impressions of an Ultra-Light Racing Weapon

Introduction

Some racing shoes arrive quietly. This is not one of them. The ASICS Metaspeed Sky Tokyo launch edition made a strong impression at its debut event, and the specifications alone explain why: 39.5mm of stack in the heel, 34.5mm in the forefoot for a 5mm drop platform, and a claimed weight of just 129g, or 4.5 oz. That is likely the lightest shoe on the market for a stack height this tall.

It also debuts a new midsole compound called Flight Foam Leap, an APTU foam described as very soft, very compliant, and very bouncy. Everything about this shoe is built around one idea: reduce weight as much as possible without giving up race-day performance.

Who This Shoe Is For

This is a shoe for runners who already have efficient mechanics and want maximum speed for shorter race distances. It is playful, extremely light, and quick through every phase of the stride. It is not a shoe for everyone, and it is honest about that. Runners who need a stable, forgiving platform for long efforts should look elsewhere in the lineup.

If you love the feeling of a shoe that pitches you forward and wants to go faster, this one will click immediately. If you prefer security and calm underfoot, it may feel like too much.

Main Strengths

The headline feature is the new Flight Foam Leap APTU midsole. It is very soft, very compliant, and very bouncy, with more than enough cushioning to handle a full marathon distance on paper. The ride feels like a catapult: the aggressive rocker geometry pitches you quickly onto the midfoot and forefoot, opens up your stride, and keeps transitions through the heel remarkably fast.

The carbon plate is an interesting design choice. Rather than a full-length plate, it covers roughly a third to half of the shoe, positioned in the middle and stiffening up at the forefoot. The result is slightly more flex than other Sky models, but it is still plenty stiff for racing and very responsive. The Matrix upper adds a more robust hold, and it does a genuinely good job of locking the foot down on a platform that could otherwise feel squirrely.

It was also more stable than expected, which counts for a lot given how soft the foam is. At 4.5 oz, the weight advantage is felt the moment you pick up the pace.

Things to Consider Before Buying

The trade-offs are real. This is a soft shoe, and it is a little unstable. That instability means suitability depends heavily on the individual runner’s mechanics and comfort preferences rather than on the shoe itself. For the marathon distance in particular, it is not a shoe that will work for everyone, and longer-test impressions are still needed to judge it over 26.2 miles or 42 km.

For 5K and 10K racing, it is an easy recommendation. A half marathon also seems within reach for confident runners. The marathon remains the question mark, not because of cushioning, but because of how the platform behaves under fatigue.

Buying Advice

If you race short and want the lightest high-stack option available, this shoe deserves a spot at the top of your list. Run in it, and it delivers a bouncy, responsive, genuinely fun ride that rips your stride open.

If your goal race is a marathon and you value stability above all else, test it carefully before committing, or consider a more stable model in the same family. Fit matters too: the Matrix upper holds the foot well, but a shoe this light and soft rewards runners with tidy foot strike mechanics.

Conclusion

The ASICS Metaspeed Sky Tokyo launch edition is one of the most exciting racing shoes of the moment: 129g, a tall 39.5mm heel stack, new Flight Foam Leap APTU foam, and a partially placed carbon plate that keeps things responsive with a touch more flex. It is soft, a little unstable, and not for everyone, but for 5K, 10K, and possibly half marathon racing, it is a lot of fun to run in and feels like pure speed underfoot.