Brooks Glycerin 20 vs. ASICS Gel-Cumulus 24

Midsole War

The Brooks Glycerin 20 relies on DNA LOFT v3, a nitrogen-infused EVA foam that prioritizes plushness over energy return. At 10mm of stack height and a 10mm drop, it’s built for maximum shock absorption, but lacks the snap of more responsive compounds. The ASICS Gel-Cumulus 24’s FLYTEFOAM midstep is denser, with an 8mm drop that promotes a smoother roll-through. The Gel-Cumulus 24 sacrifices some softness for better transition efficiency—critical for runners who don’t want their shoe to feel like a sponge.

Upper & Lockdown

The Glycerin 20’s engineered mesh upper is padded to the point of excess, creating a plush but slightly bulky feel. The ASICS Gel-Cumulus 24 uses a more breathable, single-layer mesh with strategic reinforcements. The heel counter on the Glycerin 20 is more rigid, which could irritate those with narrow heels. The Gel-Cumulus 24’s internal heel clutch provides a snugger, more adaptive fit without unnecessary bulk. If you prioritize airflow and precision fit, ASICS wins here.

Performance at Pace

Both shoes weigh 10.1 oz, but the Gel-Cumulus 24’s FLYTEFOAM midsole and lower drop make it the better choice for picking up the pace. The Glycerin 20’s DNA LOFT v3 excels at dampening impact but feels sluggish during tempo runs. The Gel-Cumulus 24’s firmer ride offers a more connected feel to the ground, allowing for quicker transitions. The Glycerin 20 is strictly a cruiser—great for easy miles, but a liability if you want to push.

Biomechanical Suitability: Neutral Runners

The Glycerin 20’s high cushioning makes it ideal for neutral runners logging high mileage on hard surfaces. Its forgiving midsole reduces joint stress but may encourage heel-striking due to the exaggerated drop. The Gel-Cumulus 24’s 8mm drop and balanced cushioning offer a better compromise for midfoot strikers. Runners who prefer a more natural gait cycle will appreciate the ASICS’ less intrusive geometry.

Biomechanical Suitability: Overpronators

Neither shoe provides stability features, but the Gel-Cumulus 24’s firmer midstep offers marginally better support for mild overpronators. The Glycerin 20’s ultra-soft DNA LOFT v3 compresses too easily under excess pronation, potentially exacerbating instability. If you’re a mild overpronator needing cushion, the Gel-Cumulus 24 is the safer bet—though neither should be considered a true stability shoe.

Value

At similar price points, the Gel-Cumulus 24 delivers better versatility. The Glycerin 20 is a one-trick pony—great for recovery days but limited beyond that. ASICS’ shoe transitions smoothly from easy runs to moderate paces, making it a better investment for runners who want a single daily trainer. If you already have a speed shoe in your rotation, the Glycerin 20’s plush ride might justify its niche.

Podiatrist Verdict

Winner: ASICS Gel-Cumulus 24. It strikes a superior balance between cushioning and responsiveness, with a more adaptable upper and better biomechanical efficiency. The Glycerin 20 is over-engineered for pure softness, sacrificing versatility in the process. Unless you’re exclusively seeking max cushion for slow miles, the Gel-Cumulus 24 is the smarter, more functional choice.