Brooks Men's Glycerin GTS 21 Supportive Running Shoe - Plush

Our review of the Brooks Men's Glycerin GTS 21 finds it best for runners who want maximum softness combined with reliable support. The single biggest reason to consider these shoes is the pairing of nitrogen-infused DNA LOFT v3 cushioning with the GuideRails holistic support system, which delivers pillowy comfort without feeling unstable. The Glycerin GTS 21 is presented as the more supportive successor to the Glycerin 20 and carries the APMA Seal of Acceptance, making it a strong pick for road runners or anyone seeking cushioning that helps relieve foot and knee discomfort.

Key Features

• GuideRails support: Keeps excess movement in check by supporting the body along its natural motion path for steadier runs and workouts.
• DNA LOFT v3 cushioning: Nitrogen-infused foam offers supreme softness that is designed to remain responsive and durable while feeling plush underfoot.
• Plush internal fit: An internal stretch bootie hugs the foot and expands with the stride for a comfortable, sock-like fit that reduces hotspots.
• Engineered warp knit upper: Breathable and flexible material provides an accommodating fit for slightly wider feet while staying soft against the skin.
• Broad platform: Stabilizes the foot and promotes smooth heel-to-toe transitions for a steady, cushioned ride on roads and in the gym.
• APMA Seal of Acceptance: Recognized design that supports foot health, which is reassuring for runners with knee or foot pain concerns.

Who It's For

The Glycerin GTS 21 is ideal for men who prioritize maximum cushioning but still need corrective support, such as runners with mild overpronation or those recovering from foot discomfort. It works well for road running, cross training, and daily gym sessions where a soft yet supported ride is desired.

Runners seeking a very lightweight racer or minimal shoe should look elsewhere, as these are built for plush cushioning and stability rather than speed. Also, those who prefer an ultra-firm ride or a very narrow racing fit may find the stretch bootie and broad platform less suited to their needs.

Pros & Cons

Pros

• Exceptionally comfortable cushioning that reduces pressure and eases impact on knees.
• GuideRails holistic support offers controlled motion without feeling restrictive.
• Accommodating, breathable upper and internal stretch bootie provide a soft, adaptive fit for wider feet.
• Recognized by the APMA for features that support foot health.

Cons

• Some customers report variable durability, so longevity may differ by runner and use case.
• The plush, protective design adds weight compared with minimalist or racing shoes.

Specifications

Model	Glycerin GTS 21
Intended use	Road running, cross training, gym
Support system	GuideRails holistic support
Cushioning	Nitrogen-infused DNA LOFT v3
Upper	Engineered warp knit with internal stretch bootie
Predecessor	Glycerin GTS 20
Seal	APMA Seal of Acceptance

Our Verdict

The Brooks Men's Glycerin GTS 21 is a strong choice for runners who want plush cushioning paired with meaningful support; its GuideRails system and DNA LOFT v3 foam make it especially good for those with foot discomfort or mild overpronation. It represents good value for anyone prioritizing comfort and stability over a minimal or lightweight racing feel.

Frequently Asked Questions

Are these shoes good for wide feet?
The engineered warp knit upper and internal stretch bootie provide an accommodating fit that many customers report works well for wider feet.

Do they help with knee or foot pain?
Many users find the plush cushioning and holistic support relieve pressure and help reduce knee and foot discomfort during runs.

How do they differ from the Glycerin 20?
The GTS 21 adds the GuideRails support to the Glycerin 20 platform and updates cushioning to DNA LOFT v3 for a softer, more supportive ride.