Brooks Glycerin 23 Review: More Foam, Less Drop, Total Comfort

Written by Lauren Haislip

Quick Answer:

The Brooks Glycerin 23 is a premium neutral daily trainer featuring nitrogen-infused DNA TUNED cushioning and a new 8mm drop. By adding 2mm of foam to the forefoot, Brooks has created a more balanced, energetic ride that excels during long recovery runs and daily mileage for runners seeking maximum underfoot protection.

Key Takeaways

• DNA TUNED Midsole: Employs zonal nitrogen infusion with larger cells in the heel for soft landings and smaller cells in the forefoot for better response.

• Lower Drop: Shifted from 10mm to 8mm, providing a more stable, centered feel compared to the Glycerin 22.

• Refined Upper: Uses a new triple jacquard warp knit that balances a secure midfoot lockdown with a breathable, accommodating toe box.

• GTS Version Available: Runners needing stability can opt for the Glycerin GTS 23, which adds GuideRails support to the same plush platform.

A New Benchmark for the "Glycerin" Legacy

Set the scene. You finish a long Saturday run and your legs feel about as useful as a screen door on a submarine. If you’ve ever spent a long day on your feet, you know the value of a shoe that does the heavy lifting for you. The Brooks Glycerin 23 isn't some wild, "burn the blueprints" reinvention. Instead, it’s a calculated refinement of what a max cushion shoe should be. It’s like finding a lone sock in the dryer: a small, unexpected win that makes the whole day feel more complete.

For years, the Brooks Glycerin series has been the gold standard for neutral runners. They want to feel nothing but soft foam underfoot. This latest iteration tweaks the geometry to keep you more balanced. In the world of running footwear, few models stay this consistent while pushing the tech. If you’re transitioning from the Brooks Ghost 17, you’ll find a significant step up in luxury here.

Technical Specifications: Glycerin 23 vs. Glycerin 22

When we look at the numbers, the most striking change is the geometry. Brooks didn't just add foam. They shifted where it actually sits.

Why the 8mm Drop Matters

For a long time, Brooks was the king of the high 12mm drop. By moving the Glycerin 23 to an 8mm offset, they have brought the foot into a more neutral position. This change is subtle. However, for runners who felt the previous models were too "heel-heavy," the 23 feels significantly more athletic. It encourages a smoother transition from the midfoot through the toe-off. This happens without sacrificing the protection that neutral running shoes are known for.

The Midsole Magic: DNA TUNED Explained

The heart of this shoe is the DNA TUNED foam. While it sounds like marketing jargon, the tech is actually quite practical. Brooks uses a process of nitrogen infusion. This creates different cell sizes within a single piece of foam.

1. Plush Heel Landings

The heel contains larger nitrogen cells. This allows the foam to compress more easily. It acts like a soft pillow when you first make contact with the pavement. It’s the kind of sensation you want on mile 15 of a marathon training run. This is especially true when your form starts to get a bit sloppy.

2. Energetic Toe-Off

As you move toward the front of the shoe, the cells become smaller and more densely packed. This prevents the "mushy" feeling that plagues some max-cushion competitors. Does anyone actually enjoy feeling like they are running through waist-deep oatmeal? Instead of sinking into the shoe and staying there, the forefoot provides a firm enough platform to push off with some intent.

3. Added Forefoot Stack

Brooks added 2mm of extra foam to the forefoot. They have effectively shielded your metatarsals from the harsh realities of concrete. If you’ve struggled with forefoot pain, this extra layer is a welcome upgrade. It pairs perfectly with our injury prevention gear for those high-mileage aches.

Upper Construction and Fit

The "Step-In" feel is a hallmark of the Brooks brand. The Glycerin 23 doesn't miss. The new triple jacquard warp knit is a bit more structured than the previous mesh. However, it feels even softer against the skin.

Comfort and Breathability

The upper behaves like a premium lounge chair for your foot. It holds the midfoot securely while allowing the toes to splay naturally. Ventilation has been improved in the toe box area. This is vital for those humid July morning runs. If your feet tend to run hot, consider grabbing a pair of moisture-wicking running socks.

Width Options

Brooks continues to lead the way in inclusivity. Both the Glycerin 23 and the Glycerin GTS 23 are available in Medium, Wide, and even Extra Wide. Finding a wide running shoe that doesn't look like a clumsy loaf of sourdough bread is rare. The Glycerin manages to keep the aesthetics clean across all sizes.

The Ride: How It Feels on the Road

Testing the Glycerin 23 is a lesson in consistency. It doesn't try to be a speed shoe. It is a road specialist designed for the "sexy pace." This is that easy, conversational speed where most of our miles happen.

Daily Training

For the everyday 5-miler, the shoe disappears underfoot. The transition from heel to toe is fluid. This is thanks to the wider platform and the concave geometry on the lateral side. It’s stable without being restrictive.

Long Runs

This is where the Glycerin 23 truly earns its price tag. The DNA TUNED foam doesn't bottom out after an hour. The cushioning feels just as vibrant at the end of a two-hour run. For those training for their first marathon, this shoe provides confidence. Your joints won't be screaming at you the next morning.

Recovery Days

When your legs are trashed from a track session, this is the shoe you reach for. It’s forgiving, soft, and stable enough to handle a tired gait. It’s a great companion shoe to a faster trainer like the Brooks Hyperion Max.

Durability and Value

At $175, the Glycerin 23 is an investment. However, Brooks reinforced the outsole with high-abrasion rubber in the high-wear zones. Most runners can expect to get a ton of mileage out of this pair.

The outsole grip is also noticeably better on wet pavement than previous versions. The rubber compound feels a bit tackier. This is a small but appreciated change for those who don't let a little rain cancel a workout.

Final Verdict

The Brooks Glycerin 23 is exactly what it needs to be. It’s the plushest, most reliable daily trainer in the Brooks lineup. The shift to an 8mm drop makes it feel more modern than its predecessors. It’s a workhorse with the heart of a luxury sedan.

Is it the lightest shoe on the market? No, but it isn't trying to be. For the vast majority of miles that make up a runner's life, it’s nearly impossible to beat. It’s comfortable, durable, and now, more balanced than ever. Buy it, run in it, and stop overthinking your footwear. Your knees will thank you.

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