THIS SHOE IS FOR: The Glycerin 18 is perfect for runners who think there's no such thing as too much cushioning. The upper enhances comfort by perfectly balancing stretch and structure. SUPPORT AND CUSHION: Provides neutral support while offering the maximum amount of cushioning. Ideal for road running, cross training, the gym or wherever you might want to take them! Predecessor: Glycerin 17. SUPER-SOFT CUSHIONING: Increased DNA LOFT super-soft cushioning allows for even more extreme softness, without losing responsiveness or durability, while the OrthoLite sockliner provides premium step-in comfort. PLUSH FIT: The plush feel of an internal stretch bootie surrounds your foot and moves and expands with your stride. The engineered mesh upper enhances the fit. SMOOTH TRANSITIONS: The plush transition zone makes every move from heel to toe feel incredibly soft and smooth.