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ALTRA Women's Experience Flow 2 Road Running Shoe, vs Under Armour Women's Charged Assert 9, Black/White, 8.5 US

Updated August 2026 — ALTRA Women's Experience Flow 2 Road Running Shoe, wins on price and fit, Under Armour Women's Charged Assert 9, Black/White, 8.5 US wins on traction.

The ALTRA Women's Experience Flow 2 offers advanced cushioning and a natural fit, while the Under Armour Women's Charged Assert 9 is a budget-friendly option with solid comfort and support.

Why ALTRA Women's Experience Flow 2 Road Running Shoe, is better

Cushioning

ALTRA uses advanced Altra EGO P35 foam for a responsive feel.

Fit

ALTRA's FootShape fit allows for natural toe splay.

Durability

ALTRA is designed specifically for road running.

Why Under Armour Women's Charged Assert 9, Black/White, 8.5 US is better

Price

Under Armour is significantly cheaper at $57.95.

Popularity

Under Armour has a higher sales rank of 2,002.

Breathability

Under Armour features a breathable mesh upper.

Overall score

ALTRA Women's Experience Flow 2 Road Running Shoe,
85
Under Armour Women's Charged Assert 9, Black/White, 8.5 US
75

Specifications

SpecALTRA Women's Experience Flow 2 Road Running Shoe,Under Armour Women's Charged Assert 9, Black/White, 8.5 US
Sales Rank171042002
MidsoleAltra EGO P35Charged Cushioning
UpperMeshBreathable Mesh
WeightLightweightLightweight
SupportMidfootMidfoot

Dimension comparison

ALTRA Women's Experience Flow 2 Road Running Shoe,Under Armour Women's Charged Assert 9, Black/White, 8.5 US

Overview of the ALTRA Women's Experience Flow 2

The ALTRA Women's Experience Flow 2 is priced at $99.99, making it a premium choice for runners. This shoe boasts a sales rank of 17,104, indicating a moderate level of popularity among consumers. Its standout feature is the Altra EGO P35 lightweight midsole foam, which is designed to provide an effortless and comfortable underfoot feel. Additionally, the shoe incorporates a rocker shape that enhances propulsion and toe-off efficiency while maintaining a natural stride. The FootShape fit allows ample room for toe movement, contributing to overall comfort during runs.

Overview of the Under Armour Women's Charged Assert 9

In contrast, the Under Armour Women's Charged Assert 9 is more budget-friendly at $57.95, making it about 42% cheaper than the ALTRA Experience Flow 2. This shoe enjoys a higher popularity, with a sales rank of 2,002. Key features include a breathable upper made from lightweight mesh, ensuring airflow to keep feet cool during workouts. The Charged midsole provides balanced impact protection, making it suitable for newer runners. It also offers midfoot support and a plush step-in feel, making it a solid choice for both training and casual walking.

Comfort and Fit

When it comes to comfort and fit, the ALTRA Experience Flow 2 emphasizes a natural foot shape, offering a secure midfoot hold while allowing toes to splay freely. This design can enhance comfort for longer runs, especially for those who prioritize a more natural running experience. On the other hand, the Under Armour Charged Assert 9 features foam padding around the ankle and a molded liner for added cushioning. This shoe is designed for immediate comfort without the need for a break-in period, making it appealing for those who want to hit the ground running.

Cushioning and Support

Cushioning is a crucial factor in running shoes, and both the ALTRA Experience Flow 2 and the Under Armour Charged Assert 9 provide unique approaches. The ALTRA shoe uses Altra EGO P35 foam, which is intended to deliver a lightweight and responsive experience. This may appeal to runners looking for a shoe that feels buoyant and energizing. In contrast, the Charged Assert 9 utilizes Charged Cushioning, which combines compression molded foam for responsiveness and durability. This could benefit those looking for a softer landing and a more cushioned ride during their runs.

Traction and Durability

For traction and durability, the Under Armour Charged Assert 9 features a rubber outsole with a flexible tread pattern. This design enhances traction, making it suitable for a variety of surfaces, including pavement and treadmills. It is engineered for steady movement, which is essential for both training sessions and casual use. Meanwhile, the ALTRA Experience Flow 2 does not provide specific details on its outsole traction, but it is designed for road running, suggesting that it is built for durability on hard surfaces. However, the absence of detailed traction specs may leave some potential buyers questioning its performance compared to the Under Armour model.

Aesthetic Appeal

Aesthetic appeal can be subjective, but both shoes offer distinct visual styles. The ALTRA Experience Flow 2 is available in a light blue color, which may attract those looking for a brighter, more vibrant running shoe. Conversely, the Under Armour Charged Assert 9 comes in a classic black and white design, appealing to those who prefer a more understated and versatile look. The choice between these styles may ultimately come down to personal preference and how the colors fit into a runner's wardrobe.

Price Comparison

Price is a significant factor for many consumers, and in this comparison, the Under Armour Charged Assert 9 is the more economical option. At $57.95, it is about 42% cheaper than the ALTRA Experience Flow 2, which is priced at $99.99. This considerable price difference may make the Under Armour shoe a more attractive choice for budget-conscious runners or those who are just starting their running journey. The ALTRA shoe, while more expensive, targets customers who are willing to invest in advanced technology and features for a premium running experience.

Which should you buy?

In conclusion, the choice between the ALTRA Women's Experience Flow 2 and the Under Armour Women's Charged Assert 9 comes down to personal preferences and priorities. If you are seeking a shoe that offers a natural fit and advanced cushioning technology, the ALTRA might be worth the investment. However, if you are looking for an affordable, comfortable, and versatile shoe for casual running and training, the Under Armour model stands out as a more budget-friendly option. Both shoes have their unique strengths, so consider your specific needs before making a decision.