Brooks Women’s Glycerin 21 Neutral Running Shoe - vs Under Armour Women's Charged Surge 4,
Updated August 2026 — Brooks Women’s Glycerin 21 Neutral Running Shoe - wins on fit and comfort, Under Armour Women's Charged Surge 4, wins on breathability.
The Brooks Women’s Glycerin 21 offers superior cushioning and comfort, while the Under Armour Women's Charged Surge 4 is a more budget-friendly and versatile option.
Why Brooks Women’s Glycerin 21 Neutral Running Shoe - is better
Cushioning
Glycerin 21 features nitrogen-infused DNA Loft v3 cushioning.
Support
Glycerin 21 provides better stability for long runs.
Fit
Glycerin 21 has an engineered warp knit upper for a snug fit.
Why Under Armour Women's Charged Surge 4, is better
Price
Charged Surge 4 is significantly cheaper at $51.95.
Weight
Charged Surge 4 is lighter at 10.05 oz.
Versatility
Charged Surge 4 is suitable for cross-training and gym workouts.
Overall score
Specifications
| Spec | Brooks Women’s Glycerin 21 Neutral Running Shoe - | Under Armour Women's Charged Surge 4, |
|---|---|---|
| Brand | Brooks | Under Armour |
| Current Price | $114.95 | $51.95 |
| Cushion Type | DNA Loft v3 | Charged Cushioning |
| Weight | Not specified | 10.05 oz. |
| Support Type | Neutral | Neutral |
Dimension comparison
Price Comparison
The Under Armour Women's Charged Surge 4 is significantly cheaper than the Brooks Women’s Glycerin 21, priced at $51.95 compared to $114.95. This makes the Under Armour option about 55% less expensive than the Brooks shoe. For budget-conscious runners or those looking for a solid entry-level shoe, the Charged Surge 4 presents a compelling option with its lower price point. However, for those willing to invest more for advanced features and comfort, the Glycerin 21 may justify the higher cost.
Cushioning and Comfort
The Brooks Women’s Glycerin 21 excels in cushioning and comfort, featuring nitrogen-infused DNA Loft v3 cushioning that is designed to provide supreme softness. This shoe is particularly suited for runners seeking the maximum amount of cushioning, making it ideal for long runs and extended periods on your feet. In contrast, the Under Armour Women's Charged Surge 4 also offers comfort with its Charged Cushioning midsole, but it targets a balance of flexibility and cushioning rather than pure plushness. While both shoes provide comfort, the Glycerin 21 is tailored for those who prioritize soft landings.
Support and Stability
When it comes to support and stability, the Brooks Women’s Glycerin 21 offers neutral support along with a broad platform that helps promote smooth heel-to-toe transitions. This design can be particularly beneficial for runners who value a stable ride. The Under Armour Women's Charged Surge 4 also delivers neutral support but focuses on flexibility, making it suitable for a variety of activities beyond running. The Brooks shoe may be more advantageous for those who need additional stability during longer runs, while the Under Armour model suits casual runners or gym-goers.
Fit and Breathability
The fit and breathability of the Brooks Women’s Glycerin 21 is enhanced by its engineered warp knit upper, which provides a soft and accommodating fit around the foot. This design helps to create a snug yet breathable environment that moves with the foot. In comparison, the Under Armour Women's Charged Surge 4 features a breathable mesh upper with synthetic overlays that offer added structure and support. While both shoes prioritize breathability, the Brooks model may provide a more customized fit due to its internal stretch bootie design.
Weight
The Under Armour Women's Charged Surge 4 is lighter than the Brooks Women’s Glycerin 21, weighing 10.05 oz. This lightness can enhance the overall running experience, especially for those who prefer a shoe that feels less cumbersome. While the weight of the Glycerin 21 is not specified, it is generally recognized that shoes designed for maximum cushioning tend to be heavier. Runners focused on speed and agility may find the Charged Surge 4 more appealing, whereas those prioritizing comfort may not mind a slightly heavier shoe.
Versatility
The Under Armour Women's Charged Surge 4 is designed to cater not only to runners but also to those engaging in cross-training and gym workouts, thanks to its durable rubber outsole that provides traction and flexibility. The Brooks Women’s Glycerin 21, while also versatile, is primarily aimed at road running. Its features are tailored for runners seeking a plush experience, which may make it less ideal for varied activities. If you are looking for a multi-functional shoe, the Charged Surge 4 may be the better choice.
Aesthetic Appeal
In terms of aesthetic appeal, the Brooks Women’s Glycerin 21 presents a sleek and modern design in a classic color scheme of black, grey, and white. This versatility allows it to pair well with various athletic outfits. The Under Armour Women's Charged Surge 4 features a striking combination of white, distant gray, and metallic silver, making it visually appealing for those who appreciate a bolder look. Both shoes have their unique style, but the choice ultimately depends on personal preference.
Which should you buy?
Choosing between the Brooks Women’s Glycerin 21 and the Under Armour Women's Charged Surge 4 largely depends on your specific needs as a runner. If supreme cushioning, comfort, and a plush fit are your top priorities, then the Brooks Glycerin 21 is worth the investment at $114.95. However, if you are looking for a more budget-friendly option without sacrificing comfort and versatility, the Under Armour Charged Surge 4 at $51.95 is a fantastic choice. Both shoes cater to different types of runners, so consider your running style and budget before making a decision.

