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SKU: 1104201D420
  • Why You'll Love It: The Glycerin GTS 21 combines the streamlined, cushy feel of the Glycerin with the supportive ride that comes with Brooks GuideRails
  • Category: Stability
  • Weight: 10.5oz
  • Drop: 10mm

Plush cushioning, meet reliable support. For the Glycerin GTS 21 women's running shoe, Brooks added 2mm more super soft DNA LOFT v3 cushioning for extra plushness, while an innovative GuideRails support system keeps you comfortably in stride. Plus an updated, streamlined upper delivers breathability.


  • All Brooks running shoes prioritize comfort, but their shoes with GuideRails technology add support by keeping excess movement in check. So you stay in your natural stride, even when you get tired.
    • Did you know support doesn’t just refer to arch support?
    • GuideRails® support aids your feet, knees, and hips.
  • Supreme softness: Compared to the Glycerin GTS 20, the Glycerin GTS 21 features 2mm more of Brooks super soft, nitrogen-infused DNA LOFT v3 cushioning to maximize softness. 
    • Innovative nitrogen infusion process lets Brooks fine-tune the softness with careful precision so shoes never sacrifice weight, durability, or responsiveness.
    • Brooks cushioning technologies all start with DNA because they react to your unique stride.
  • Improved fit: New, engineered warm knit upper is breathable and allows for a flexible, accommodating fit while staying soft against your foot.
  • Smooth, stable transitions: The broad platform stabilizes your foot and promotes smooth heel-to-toe transitions. 


  • In general, remember to leave around a thumb's width of space at the end of your walking or running shoes.
  • Widths for women:  2A = narrow;  B = standard;  D = wide
  • Widths for men:  B = narrow;  D = standard;  2E = wide;  4E = double wide