Brooks Womens Glycerin 21 Neutral Running Shoe - Supreme Soft

Our review of the Brooks Womens Glycerin 21 finds it best suited for runners and walkers who prioritize plush cushioning above all else. The single biggest reason to buy is the shoe's super-soft, nitrogen-infused DNA Loft v3 midsole that delivers a cloud-like ride without sacrificing responsiveness. The Glycerin 21's internal stretch bootie and newly engineered warp knit upper create a snug, comfortable fit that adapts to the foot, while the broad platform helps produce smooth, stable heel-to-toe transitions for long miles or all-day wear.

Key Features

• Supreme Softness: Nitrogen-infused DNA Loft v3 cushioning provides plush, lightweight, and durable underfoot comfort for long runs and extended wear.
• Plush Improved Fit: An internal stretch bootie and warp knit upper wrap the foot comfortably and expand with the stride to reduce pressure points.
• Neutral Support: Designed for neutral runners, the shoe delivers maximum cushioning without adding corrective support, making it versatile for road running and gym use.
• Smooth Transitions: A broad platform stabilizes the foot and promotes steady heel-to-toe movement for a more comfortable gait.
• APMA Accepted: The model carries the APMA Seal of Acceptance, indicating it meets criteria for foot health and comfort.
• Proven Lineage: Built as the successor to the Glycerin 20, it keeps the series focus on plush comfort while refining fit and cushioning.

Who It's For

The Glycerin 21 is ideal for neutral runners who want maximum cushioning on road runs, recovery days, or cross training sessions, and for people who spend long hours on hard floors and need exceptional shock absorption. Its soft midsole and plush internal fit also make it a good choice for casual wear when comfort is the priority.

Runners who need pronounced stability or corrective support should look elsewhere, such as models that offer guidance systems or added medial support. Also, those seeking a very lightweight race-day shoe may find the Glycerin 21 heavier than minimal racing options because it emphasizes plush cushioning over minimalism.

Pros & Cons

Pros

• Exceptionally comfortable cushioning that performs well on hard surfaces and during long wear.
• Plush, adaptive fit from the internal bootie and breathable warp knit upper.
• Smooth, stable heel-to-toe transitions thanks to a broad platform design.
• Recognized by the APMA for foot health considerations.

Cons

• Some customers report sizing can run slightly small, so trying on first or considering half a size up is advisable.
• Not intended for runners who require strong corrective support or a minimal-weight racing shoe.

Specifications

Model	Glycerin 21 (women's)
Support type	Neutral
Midsole cushioning	DNA Loft v3 (nitrogen-infused)
Upper	Warp knit with internal stretch bootie
Use cases	Road running, cross training, gym, casual wear
Predecessor	Glycerin 20
Health recognition	APMA Seal of Acceptance

Our Verdict

The Brooks Womens Glycerin 21 is a top pick for neutral runners and anyone who values plush cushioning and a roomy, adaptive fit. It delivers excellent comfort on hard surfaces and during long wear, making it a worthwhile choice for daily training and all-day use. Consider sizing carefully if you are between sizes or need corrective support, but for pure softness and a smooth ride it represents strong value.

Frequently Asked Questions

Do these run true to size?
Many customers find the fit true to size, but some report they run slightly small, so trying on or sizing up a half may help if you are between sizes.

Are they suitable for long runs on pavement?
Yes, the DNA Loft v3 cushioning and broad platform make them comfortable and protective for long road runs and extended time on hard floors.

Do these shoes provide stability for overpronation?
No, the Glycerin 21 is a neutral shoe focused on maximum cushioning; those needing added support should choose a stability model.