**TARGET AUDIENCE:** The Glycerin 21 is designed for runners who desire exceptional cushioning for unparalleled comfort. Its soft internal structure and stable transitions envelop runners in plush softness. This shoe has received the APMA Seal of Acceptance.
**NEUTRAL SUPPORT:** Delivers neutral support while maximizing cushioning. Perfect for road running, cross-training, or gym workouts! The Glycerin 20 is its predecessor, and for those needing extra support, check out the Brooks Glycerin GTS 21.
**EXTRA SOFTNESS:** Experience the pinnacle of softness with enhanced nitrogen-infused DNA Loft v3 cushioning, tailored to be lightweight, responsive, and long-lasting for ultimate comfort.
**ENHANCED FIT:** The soft internal stretch bootie adapts to your foot and moves fluidly with your stride. The newly designed warp knit upper is breathable and offers a flexible, soft fit.
**SEAMLESS TRANSITIONS:** A wide platform stabilizes your foot and facilitates smooth transitions from heel to toe.