Brooks Glycerin GTS 23: Design & Specs

The Brooks Glycerin GTS 23 is a max-cushion stability running shoe designed for runners who need both plush comfort and mild pronation support. Its specs reveal a focus on a smooth, guided ride: a 10mm drop, DNA Loft v3 cushioning, and a GuideRails support system. This article breaks down what those design choices mean for your run, who the shoe is for, and how it compares to other options.

Formula

The calculator above gives a rough “cushioning score” based on your weight and weekly mileage, scaled by the Glycerin version. The formula is:

Cushioning Score = (Weight in lb × 0.5) + (Weekly Mileage in mi × 0.1) × Version Factor

Where:

• Weight is your body weight in pounds (lb).
• Weekly Mileage is your average running distance per week in miles (mi).
• Version Factor is 1.0 for the Glycerin 20, 1.05 for the 21, 1.1 for the 22, and 1.15 for the 23 (reflecting incremental cushioning updates).

This score is a relative indicator—higher means more cushioning relative to your needs. It is not a Brooks-official metric.

Worked Example

Using the defaults: Weight = 170 lb, Weekly Mileage = 20 mi, Version = 23 (factor 1.15).

1. Weight term: 170 × 0.5 = 85
2. Mileage term: 20 × 0.1 = 2
3. Sum: 85 + 2 = 87
4. Multiply by version factor: 87 × 1.15 = 100.05

Rounded to one decimal, the score is 100.1, matching the calculator output.

Design Philosophy: Max Cushion Meets Stability

The Glycerin GTS 23 sits at the intersection of two Brooks lines: the Glycerin (neutral max cushion) and the Adrenaline (stability). The “GTS” stands for “Go-To Support.” Unlike traditional stability shoes that use a firm medial post or a hard wedge to correct overpronation, the Glycerin GTS 23 uses Brooks’ GuideRails technology. These are two firmer foam pillars on the medial (inner) and lateral (outer) sides of the heel. They don’t push your foot into a neutral position; instead, they allow natural motion and only engage when your foot moves too far, acting like bumpers on a bowling lane. This design preserves the plush feel of the neutral Glycerin while adding a subtle guiding effect.

Key Specs and What They Mean

• Weight: Approximately 10.1 oz (286g) for a men’s US 9, and 8.6 oz (244g) for a women’s US 8. This is average for a max-cushion shoe—not the lightest, but not a boat anchor.
• Drop: 10mm (heel 32mm, forefoot 22mm). This is a moderate drop that encourages a heel-strike or midfoot-strike, making it forgiving for runners who land on their heels.
• Midsole: DNA Loft v3 foam. This is Brooks’ softest and lightest foam, a blend of EVA and rubber. It’s softer than the DNA Loft in the Glycerin 19, but not as bouncy as the nitrogen-infused DNA Flash in the Hyperion line.
• Upper: Engineered mesh with a plush, padded heel collar and tongue. The fit is roomy in the toe box, with a secure midfoot wrap. It’s designed for all-day comfort, not just running.
• Outsole: Carbon rubber in high-wear areas, with blown rubber in the forefoot for flexibility. The tread pattern is a series of flex grooves that allow the shoe to bend naturally with your foot.

How It Feels on the Run

The Glycerin GTS 23 delivers a “soft but stable” sensation. The initial step-in is plush, but the GuideRails become noticeable only during dynamic movements—like a sharp turn or when fatigue causes your form to break down. The ride is smooth and rocker-like, thanks to the shoe’s geometry: a rounded heel and a slightly flared toe. This encourages a more efficient transition from heel to toe. The shoe is not a speedster; it’s best for easy runs, long distances, and recovery days. Runners who want a firmer, more responsive ride might find it too soft, while those who want maximum cushioning with a hint of guidance will feel at home.

Who Should Buy It (and Who Shouldn’t)

Ideal for:

• Runners with mild to moderate overpronation who find traditional stability shoes too harsh.
• Heel-strikers who want a high-cushion, high-drop shoe.
• Runners who prioritize comfort over speed, especially for marathon training.
• Walkers or those on their feet all day who need plush support.

Not ideal for:

• Runners with severe overpronation who need aggressive motion control (look for a shoe with a medial post).
• Forefoot or midfoot strikers who prefer a low-drop (0-4mm) shoe.
• Those seeking a lightweight, highly responsive shoe for tempo runs or races.

Common Issues and Misconceptions

A frequent misconception is that the GTS 23 is a “corrective” shoe. It is not; it’s a guidance shoe. It won’t fix your gait, but it may reduce excessive joint motion. Another issue some runners report is the upper running warm, as the mesh is dense and not highly breathable. Also, the plush heel collar can feel bulky for those with narrow ankles. Finally, the outsole durability is good but not exceptional; heavy runners may see wear at the heel after 300-400 miles, which is typical for a max-cushion shoe.

How to Choose Between Glycerin and Glycerin GTS

The main difference is the GuideRails. If you have a neutral gait and no history of overpronation, the standard Glycerin is lighter and slightly more flexible. If you have flat feet, or you’ve been told you overpronate, or you simply want extra stability on long runs, the GTS is the safer choice. A simple test: look at the wear pattern on your current shoes. If the inner edge of the sole wears down faster, you likely overpronate, and the GTS is worth trying. If the wear is even, the neutral Glycerin is fine.

Frequently Asked Questions

Is the Brooks Glycerin GTS 23 good for flat feet?

Yes, it’s a good option for mild to moderate flat feet because the GuideRails provide gentle support without forcing your arch into an unnatural position. However, if you have severe flat feet or require a rigid arch support, you may need a shoe with a firmer medial post or custom orthotics.

What is the difference between the Glycerin 23 and the Glycerin GTS 23?

The only major difference is the GuideRails system in the GTS. The Glycerin 23 has the same midsole foam, outsole, and upper, but without the extra support pillars. The GTS is slightly heavier (about 0.3 oz) and has a slightly firmer heel due to the added support.

How many miles will the Glycerin GTS 23 last?

Most runners get 300-500 miles (480-800 km) from a pair, depending on their weight, stride, and running surfaces. The outsole is durable, but the midsole foam will compress and lose its plushness over time. If you feel aches or pains after a run that you didn’t feel before, it’s likely time to replace them.

Can I use the Glycerin GTS 23 for walking?

Absolutely. The high cushioning and 10mm drop make it a comfortable walking shoe, especially for those who stand for long periods. Some users even use it as a work shoe. Just be aware that the soft foam may feel unstable on uneven terrain.

Does the Glycerin GTS 23 run true to size?

Generally yes, but the toe box is roomy. If you have narrow feet, you might want to size down half a size, or consider the standard Glycerin which has a similar fit. If you’re between sizes, it’s best to try the larger size, especially if you’ll be wearing thicker socks.

Is the Glycerin GTS 23 good for marathon training?

Yes, it’s a popular choice for long runs and marathon training because of its cushioning and stability. However, it’s not a fast shoe. For tempo runs or race day, you might want a lighter, more responsive shoe in your rotation.

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in w | Weight | lb | 170 | 0
in p | Weekly mileage | mi | 20 | 0
in g | Glycerin version | 20=1, 21=1.05, 22=1.1, 23=1.15 | 0
out score | Cushioning score | - | (w * 0.5) + (p * 0.1) * g | 1
out drop | Drop | mm | 10 | 0