Our Take 

The new Glycerin 21 bee updated from top to bottom and staff are loving it!

Compared to the Glycerin 20, the Glycerin 21 features 2mm more of Brooks’ super-soft, nitrogen-infused DNA Loft v3 cushioning to maximize softness.  Soft while feeling solid.  This is what we like most about the new midsole.

Additionally the new, engineered wrap knit upper is very breathable and allows for a flexible, accommodating fit.  Perhaps a tad wider fitting in the forefoot but in a good way.

The platform of the 21st version is also a bit broader and thus the shoe has a more stable ride.  Of course, if you need even more stability the Glycerin GTS 21 offers more support via their innovative GuideRails support system.

Specs

• Midsole Drop - 10mm
• Heel Stack – 38mm
• Forefoot Stack – 28mm
• Weight – 9.8oz

Technology

• DNA Loft v3 nitrogen-infused foam delivers amazing cushioning while maintaining a responsive feel underfoot.
• Engineered Knit upper for seamless comfort.
• Roadtack Rubber includes recycled silica and provides great traction.