With even more nitro-infused foam than before, the Brooks Glycerin 21 returns to deliver an ultra-comfortable and smooth ride for any distance.

In this update, the Glycerin 21 adds 2mm more plush and responsive DNA Loft v3 foam into the midsole, offering a little extra softness to a shoe that's already plenty soft. As a cherry on top, the additional cushioning does not come at the expense of extra weight. On the contrary, the Glycerin 21 weighs almost an ounce less than the previous model! 

Bringing long-lasting traction to the party is the new RoadTack rubber that is strategically placed in the outsole to deliver the grip needed to rack up the miles. This shoe is rounded out with a new engineered warp knit upper that checks the boxes of being accommodating, secure, and breathable, which only adds to the supreme comfort the Glycerin brings to the table. 

Running farther has been made easier than ever thanks to the Brooks Glycerin 21––all you have to do is enjoy the ride. 

What You’ll Love 

• Nitrogen-infused DNA Loft v3 is soft yet bouncy 
• New engineered warp knit upper is secure and breathable 
• Stable underfoot with widened midsole and outsole platform