The Beast '18 is the ultimate in protective comfort, now with a roomier fit. The Super DNA midsole provides 25%more adaptable cushining than Brooks standard DNA midsole. The ExtendedProgressive Diagonal Rollbar guides your body back into its natural motion path with added support. The improved fit of the soft, engineered air mesh upper offers a spacious toe box, structured saddle, and an external heel counter for reinforced stability.