You already love the support. Now it comes with even more softness in the men's Adrenaline GTS 21, a road-running shoe that feels like it was made for just your stride. DNA LOFT cushioning now extends throughout the midsole for an even smoother transition from heel to toe. We’ve shifted our focus beyond the feet to the most injury-prone part of a runner’s body: the knees. GuideRails® support keeps you moving comfortably by keeping excess movement in check. The new Engineered Air Mesh upper hugs the foot for a secure fit while also improving breathability.