The Brooks Ariel is designed for runners with low or flat arches who need to control excess pronation. Synthetic/Air mesh upper adds comfort and breathability. Ultimate Sockliner with IMPLUS® provides cushioning and durability. Internal Support Sleeve (ISS) helps “wrap” the foot. Engineered MC-Pod configuration maximizes support. HydroFlow® ST-XL in rearfoot optimizes cushioning and stability. Extended Diagonal Rollbar™ helps minimize overpronation. DRB™ Accel design increases midfoot support. High durability carbon rubber outsole. HPR™ Plus in heel strike area increases durability. Crumple zone smoothes out initial impact with the running surface. Wt. 12.3 oz.