Lace up and head out in supreme comfort. For the men's Glycerin GTS 21, Brooks added 2mm more super soft DNA LOFT v3 cushioning for extra plushness, while our innovative GuideRails support system keeps you comfortably in stride. Plus an updated, streamlined upper adds breathability.

Tech & Features:

• 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 maximise softness.
  
• Improved fit - new, engineered warp knit upper is breathable and allows for a flexible, accomodating fit while staying soft against your foot.
• Smart support - Brooks innovative GuideRails technology supports your body in its natural path while keeping excess movement in check.