Product Description Brooks Glycerin GTS 20 has the softest cushioning with industry-leading support for supreme comfort. Nitro-infused softness: Experience soft strides like never before in the Glycerin GTS 20 with innovative nitrogen-infused DNA LOFT v3 technology. This delivers ultimate softness and comfort under your feet, with GuideRails® support technology to give you stability and keep excess movement in check. Updated midsole features nitrogen-infused DNA LOFT v3, our softest cushioning yet. New cushioning and redesigned outsole deliver stability and smoother transitions. All-new engineered mesh upper is lightweight and breathable. GuideRails technology offers support and stability.