Brooks Glycerin 21 Men's Cushioned Nitrogen Marathon Running Shoe 120410-1B-103

Brooks Glycerin 21 — Men's Cushioned Nitrogen Marathon Running Shoe

Experience the pinnacle of Brooks cushioning technology. The Brooks Glycerin 21 is the brand's most luxuriously cushioned daily trainer, engineered for male runners who demand maximum softness underfoot without sacrificing responsiveness. From long Sunday runs to full marathon efforts, the Glycerin 21 wraps every stride in plush, nitrogen-infused comfort.

Key Technologies

• Nitrogen-Infused DNA LOFT v3 Foam — Brooks' most advanced midsole compound yet — nitrogen-infused for an ultra-soft, cloud-like feel that remains lightweight and responsive across every mile.
• Fit Knit Upper — A seamless, sock-like engineered knit upper that conforms to the natural shape of your foot, delivering a personalized, irritation-free fit from the first step to the last.
• Segmented Crash Pad — An integrated outsole system that adapts to your unique footstrike pattern, ensuring a smooth, fluid heel-to-toe transition on any surface.
• Plush Collar & Tongue — Extra padding around the ankle and tongue provides a premium, hotel-slipper-soft feel that keeps you comfortable through the longest training blocks.
• Durable Blown Rubber Outsole — High-abrasion rubber zones deliver long-lasting grip and traction on roads and tracks alike.

Product Details

• Style Number: 120410-1B-103
• Gender: Men's
• Category: Road Running / Marathon / Daily Trainer
• Fit Type: Narrow (B Width)
• Upper Material: Fit Knit engineered mesh
• Midsole: Nitrogen-infused DNA LOFT v3 foam
• Outsole: Blown rubber with segmented crash pad
• Best For: Long runs, marathon training, everyday comfort

Who It's For

The Glycerin 21 is built for runners who prioritize maximum cushioning above all else. Whether you're recovering from a hard workout or logging big mileage weeks, this shoe delivers the plush, protective ride your legs deserve.

"Step into the Glycerin 21 and feel what 20+ years of cushioning innovation feels like — soft, smooth, and endlessly comfortable."