Did you love the Glycerin 17 but wish it had even more DNA Loft cushioning Do you love a plush yet responsive cushioning underfoot Then the Glycerin 18 just might be for you! This version 18 takes what you loved, adds more of that awesome cushioning you know and love while keeping the weight down using a new rubber compound called green rubber to both improve traction and lightening up the shoe. A slightly redesigned stretch double-jacquard mesh becomes more flexible and breathable while maintaining a great lockdown and structure.