16 users: 4.6 / 5
Terrain: Trail
Weight: Men 12.5oz / Women 10.9oz
Heel to toe drop: Men 12mm / Women 12mm
Arch support: Neutral

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  • The Mizuno Wave Mujin 4 takes the original off-road, aggressive shoe, and upgrades it to provide even more grip, protection, and toughness, all while still maintaining the extreme comfort level of the past editions. The shoe is ideal for runners who are looking for a well-cushioned racing shoe or a minimal training shoe, and it is designed to handle hard, rocky mountains, wet surfaces, or even the muddiest pools on the trail.
  • The shoe’s AIRmesh upper continues to keep the foot cool and dry. Its open construction promotes airflow to ensure the breathability of the Wave Mujin 4.
  • The midsole is a combination of U4ic midsole and the Mizuno Wave technology, both of which work together to ensure the shoe is stable and comfortable. It sits on a Michelin rubber outsole that delivers unprecedented traction across all surfaces.

Because the Wave Mujin 4 has a standard running shoe length, wearers are recommended to get a pair that is true to their size. The available width profiles for the Wave Mujin 4 are D – Medium for the men’s version and B – Medium for the women’s version.

The outsole of the Wave Mujin 4 is made from X10 rubber, which guarantees durable protection for the midsole and traction for a variety of surfaces. Located in the heel and toe areas, the X10 outsole promises a steady grip on these high-wear parts during the landing and toe-off phases. The outsole of the Wave Mujin 4 also used the X10 outsole material.

Meanwhile, the rest of the outsole is made up of Michelin rubber. It emphasizes the durability and grip provided by the X10 rubber while supplying a protective layer for the remainder of the sole unit.

The Wave Mujin 4 still uses the XtaRide gripping lugs and flex groove system, which is suitable for trail running because of its adaptive quality. The unique layout of the lugs allows for a natural movement of the foot.

An ESS rock plate is installed in between the outsole and the midsole. It has a robust character that efficiently protects and guards the foot against debris.

The Mizuno Wave Mujin 4 uses AP+, a full-length foam compound that produces a lightweight feel while also offering a responsive ride. It boasts of durable and resilient characteristics that prevent it from wearing easily, thus having a longer lifespan compared to other midsole materials.

Aside from the AP+, this shoe also includes the U4icX in the heel of the midsole. This lightweight iteration of the brand’s classic U4ic midsole foam enables a cushioned landing that gives a comfortable feel for the runner.

As part of the Wave series, the Mizuno Wave Mujin 4 utilizes the Mizuno Wave technology, which permits the midsole to deliver both cushioning and stability. The Mizuno Wave comes in the form of a thermal plastic that effectively pads the heel during foot strike and carefully reduces the shock.

An AIRmesh upper allows the Wave Mujin 4 to be a breathable shoe that keeps the foot cool and dry. The material has a lightweight characteristic that lets easy wear and a comfortable sensation that is essential for all-day wear.

The upper also employs DynamotionFit, a design concept that equips the foot with an adaptive, optimal fit through a stretchable-quality material. DynamotionFit prevents the heel collar from buckling under pressure.

Size and fit

True to size based on 9 user votes
Small (0%)
True to size (78%)
Large (22%)
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Same sizing as Mizuno Wave Mujin 6.

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How Wave Mujin 4 compares

This shoe: 78
All shoes average: 85
58 99
This shoe: $140
All shoes average: $130
$60 $250
This shoe: 12.5oz
All shoes average: 10.4oz
5oz 24oz
Jens Jakob Andersen
Jens Jakob Andersen

Jens Jakob is a fan of short distances with a 5K PR at 15:58 minutes. Based on 35 million race results, he's among the fastest 0.2% runners. Jens Jakob previously owned a running store, when he was also a competitive runner. His work is regularly featured in The New York Times, Washington Post, BBC and the likes as well as peer-reviewed journals. Finally, he has been a guest on +30 podcasts on running.