Verdict from 1 expert and +100 user reviews

9 reasons to buy

  • Most of the reviewers took notice of the great comfort delivered by the SpeedForm Gemini 2.1.
  • It offers good flexibility despite the well-cushioned ride, according to some runners.
  • There is a good balance between cushioned comfort and feel for the road in this shoe, based on a couple of reviews.
  • It is very breathable, as noted by a handful of runners.
  • There are 5 color combinations.
  • The cushioning is noticeable without being too soft, as remarked by several runners.
  • A good number of users loved the good looks of the 2.1 version of the SpeedForm Gemini.
  • It is quite light for a lot of shoe, according to a more than a few runners.
  • A few runners were impressed by the upper’s ability to dry quickly.

5 reasons not to buy

  • The price is a bit stiff for more than a few.
  • It needs some break-in time, based on the observations of a few runners.
  • A handful of runners experienced blisters in their Achilles heels.
  • It is rather small.
  • The 2.1 version of the SpeedForm Gemini required a break-in period, based on a few comments

Bottom line

The Under Armour designed the SpeedForm Gemini 2.1 for marathons and daily trainings. It has adequate cushioning for miles on the road and for repetitive poundings of day to day running. There is excellent arch support in this shoe and is superbly comfortable. It is great choice for those looking for a durable, flexible, and a light training partner or marathon shoe.

Tip: see the best running shoes.

Good to know

  • Under Armour introduces minimal changes in the 2.1 model of the SpeedForm Gemini. The latest version uses a new mesh that is quite bigger and with numerous holes. With this update, the upper promises to be more durable and with better breathability.
  • The upper is not as stiff as before and should create a more form-friendly fit. It gives runners an adaptive fit that conforms to the foot with every stride.

The fit of the 2.1 SpeedForm Gemini is very similar to the earlier version. The main difference is the latest model’s more sock-like fit due to the softer upper. It has standard shoe size and with adequate space in the toe box. The substantial heel counter locks down the rear portion of the shoe while midfoot hold is sufficient.

The outsole of the SpeedForm Gemini 2.1 is very well articulated from the heel to the forefoot. There are rather deep flex grooves with clear separation between the rubber pods. This design helps with the shoe’s excellent flexibility. The outsole also uses mostly blown rubber for enhanced traction with carbon rubber in the heel for improved durability. This outsole configuration is also utilized in the Gemini 3 running shoe.

Under Armour has a very simple approach in the midsole of the SpeedForm Gemini 2.1. Running the length of this shoe is a somewhat thick Under Armour-exclusive Charged Cushioning foam. It gives the shoe adequate durability and responsiveness. For more support and stability, TPU inserts called ArchForm are located in the heel and arch areas of this shoe.

The new upper begins with a more breathable mesh that is also more adaptive. It offers better wraparound comfort and fit. The shoe has excellent heel security courtesy of a very prominent external heel counter. There is added cushioning and support as a molded and fixed sockliner is located in the shoe’s interior. Both the tongue and the ankle collar are quite thin, but lined with soft and plush fabric.


How Under Armour SpeedForm Gemini 2.1 ranks compared to all other shoes
Top 42% road running shoes
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Top 38% Under Armour running shoes
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Top 40% neutral running shoes
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The current trend of Under Armour SpeedForm Gemini 2.1.
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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.