Good to know

  • The Asics Gel Nimbus 21 SP is a neutral road running shoe that will make every runner confident to push their activities to the next level. With the construction of the re-engineered Gel Nimbus 21, a high level of comfort and fit are promoted. The utilization of the new engineered mesh aims to provide more breathable and supportive coverage. Its spacious toe-box and Gel technology, which lies in the forefoot area, give the foot more space to spread and move. Featured in the shoe is the external clutch counter, which is essential in providing the heel with enough support during the running session. 
  • The SpEVA 45 lasting foam is integrated into the footwear. The primary focus of which is not just to absorb shock but also to increase rebound and durability.
  • This running shoe uses FlyteFoam Propel technology. The main goal of this is to provide a bouncier riding experience. 
  • The Asics Gel Nimbus 21 SP uses the lateral full-contact outsole. This is significant in giving the runner a more stable and smoother ride.

The Asics Gel Nimbus 21 SP is reflective of the structure of its base shoe, which follows the standard running shoe measurements. The shoe is available in men’s and women’s versions, with fit specifications that cater to neutral pronators, such as a high arch height and moderate heel and midfoot widths.

Like the Asics Gel Cumulus 20, the AHAR is integrated into the outsole of the Asics Gel Nimbus 21 SP. AHAR stands for Asics High Abrasion Rubber. This material is strategically placed in key areas of the shoe. This component of the footwear aims to deliver exceptional durability.

The Rearfoot and Forefoot Gel technology are used in crafting the shoe. This cushioning system is vital in attenuating shock during the toe-off and impact phases. As the foot transitions through the gait cycle, it allows natural movement as well.

Utilized in the shoe is the Impact Guidance System (I.G.S.) technology. The I.G.S.  is focused on enhancing the natural gait of the foot during the heel-to-toe transition phase.

Described as the vertical flex grooves called the Guidance Line Midsole Technology is integrated into the footwear. This component of the Asics Gel Nimbus 21 SP is to enhance gait efficiency.

The Guidance Trusstic System is integrated into the shoe. This technology integrates Guidance Line construction to improve efficiency without compromising the midfoot structural integrity.

Used in making the shoe is the Ortholite X-40 sockliner. This material is described as a premium sockliner that offers higher rebound properties. The sockliner is also meant to provide breathability and moisture management. As a result, a healthier foot environment is encouraged.

Asics added the energetic foam formulation called the Flytefoam Propel technology. This material is made of a unique elastomer compound that provides a bouncier ride.

The additional height of 3mm is added to the women's models. This component of the shoe aids in the relief of Achilles tension.

Featured in the shoe is the Flytefoam Lyte technology. This technology is Asics' lightest weight midsole formulation. It has organic nanofibers that continuously provide cushioning throughout the run.

Comprising the upper area is the gradient mesh. This component of the running shoe aims to deliver lightweight breathability. With the utilization of larger openings in the high heat areas, the foot is allowed to stay cool and dry as well as move naturally without sacrificing the shoe's structure.

Used in building the running shoe is the FluidFit. This feature of the Nimbus 21 SP consists of stretchable and multi-directional mesh. This is essential in providing a glove-like and individualized fit. 

The Heel Clutching System is integrated into the Asics Gel Nimbus 21 SP. This is an exoskeletal heel counter that aims to improve support and create an enhanced heel fitting environment.

The Gel Nimbus 21 SP employs the 45-degree full-length SpevaFoam 45 lasting. This material is strategically designed to deliver a softer platform feel. As a result, improved comfort is offered.

Designed with reflective materials in the upper unit, visibility is improved, especially in low light conditions.


How Asics Gel Nimbus 21 SP ranks compared to all other shoes
Bottom 46% road running shoes
All road running shoes
Top 44% Asics running shoes
All Asics running shoes
Bottom 46% neutral running shoes
All neutral running shoes


The current trend of Asics Gel Nimbus 21 SP.
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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.