The Brooks Glycerin StealthFit GTS 21 Running Shoes offer supreme softness and a do-it-all design. These shoes are now equipped with more super-soft, nitrogen-infused DNA LOFT v3 cushioning that is optimized to be lightweight, responsive, and durable for plush comfort. Their updated flat knit upper features an Adaptable StealthFit that offers a blend of stretch and compression that moves with your foot. While Brooks’ innovative GuideRails Holistic Support System technology supports your body in its natural motion path while keeping excess motion in check.