Sole material Rubber Outer material Synthetic About this item COMFY SNEAKS: Introducing the Brooks Glycerin 20 sneakers, a new redesigned Glycerin where midsole and outsole offer a widened platform for smoother, easier transitions QUALITY BUILD: Sneaks feature a plush and breathable engineered air mesh upper for a secure fit, comfortably holding the foot in place, along with a soft textile lining and insole, and are set on rubber outsole LACE-UP CLOSURE: Easy to pull on and off, our Brooks Glycerin 20 running shoes showcase a lace-up closure that ensures a secure and precise fit and also feature a cushioned tongue and collar as well OPTIMAL SUPPORT: Our running sneakers are crafted utilizing our innovative nitrogen infusion process that allows fine-tuning the softness with careful precision, so we never sacrifice weight, durability, or responsiveness In good condition.