Brooks Glycerin 20 Review: A Cushioned Daily Trainer That Keeps Getting Lighter

Introduction

The Brooks Glycerin 20 marks a significant refresh for one of the brand’s best-known cushioned trainers, and the headline change is the new DNA LOFT v3 foam. It’s a nitrogen-infused midsole that brings a livelier, more modern feel to a shoe that has always prioritized comfort. The Glycerin line also comes in a GTS variant, but this review focuses on the neutral, non-GTS version.

Who This Product Is For

This is a daily trainer aimed at runners who log easy miles. Longer runs, recovery runs, and daily mileage are where the Glycerin 20 genuinely excels. It is not a tempo-day shoe or a race shoe, and it does not pretend to be one. If most of your week is spent at conversational pace, this sits squarely in your wheelhouse.

Main Strengths

The new DNA LOFT v3 foam is the star. It compresses generously but avoids the mushy feeling that plagues some softer foams, largely thanks to a thicker and durable outsole. The result is a cushioned ride that still feels composed underfoot. The sole also carries a little extra width, which keeps the platform feeling stable without turning the shoe into a stability model. This remains a definitively neutral trainer.

Smoothness is another highlight. From the midfoot through the forefoot, the ride rolls along nicely, and the cushioning feels consistent and pleasant underfoot.

Upper and Fit

The upper fits normal to slightly wider throughout, similar in feel to the Brooks Adrenaline. Length runs slightly short, though not enough to demand sizing up, so it should be true to size for most runners. If you sit between sizes, that’s worth factoring in.

Weight is a genuine win. At 10.1 ounces with a 10 millimeter drop, the Glycerin line continues to shed weight, and you can feel it on your feet. It still skews toward the easy-mile end of the spectrum, but it no longer feels like a heavyweight trainer.

Things to Consider Before Buying

One design quirk deserves attention: the posterior heel flare. There’s a small bevel at the back of the heel, but the extension of the heel sits fairly far back. For heavy heel strikers, that geometry can encourage slightly early ground contact, which makes the ride feel a touch clunky at initial contact.

The heel feels a bit clunky in general, though not in a way that ruins the experience. If you land midfoot or forefoot, you’ll be fine. If you’re a pronounced heel striker, it’s simply something to be aware of before buying.

Buying Advice

As a daily trainer, the Glycerin 20 is genuinely impressive, and Brooks seems to be on a strong run of form with this update. The foam feels comparable in character to some of the livelier modern foams on the market, while the overall package stays true to the cushioned, comfortable identity the Glycerin line has always had.

Buy it if your training is built around easy and recovery miles, you prefer a neutral platform with a slightly wider footprint, and you want cushioning that doesn’t collapse into mush. Think twice if you’re a heavy heel striker bothered by early contact at the heel, or if you want a shoe for faster-paced sessions. The GTS version, with its added support elements, is worth a look if you lean toward guidance features, but this neutral version is the cleaner pick for most daily trainers.

Conclusion

The Brooks Glycerin 20 is a well-executed refresh: a nitrogen-infused DNA LOFT v3 midsole that cushions without mush, a lighter body than previous versions, and a fit that works for most foot shapes. Its only real caveat is the posterior heel flare, which may bother heavy heel strikers. For easy miles and daily training, it’s an easy recommendation.