Optimizes airy softness and electrifying responsiveness at every point of every step. Introducing the Glycerin Max Black/ Ebony/ Winter Sky lace up Performance Sneaker from Brooks. Designed with two types of nitrogen-infused cushioning, seamlessly tuned into one midsole. Expertly crafted GlideRoll Rocker features dramatically sculpted bevel and toe spring geometries for effortless heel-to-toe transitions. That’s running redefined.