From their site: To us it’s the Beast®. But to the ever-increasing and exceptionally loyal runners who swear by it, it’s called salvation. In updating the Beast® to be even better, Brooks combines maximum support and long-lasting cushioning into an adaptable shoe any self-respecting motion-control freak won’t want to live without.

The Beast features:
MIDSOLE

• Rearfoot HydroFlow® ST-XL

• Forefoot HydroFlow®

• Full-length MoGo

• e1 Rearfoot Polymer

• e² Forefoot Polymer

• Extended Progressive Diagonal Rollbar (PDRB®)

• DRB® Accel

• Full-length S-257 Cushsole

OUTSOLE

• HPR Plus

• HPR Green

• Engineered MC Pod Configuration

• Slip-resistant (ASTM F 489-96)

UPPER

• Ultimate Sockliner

• Moisture-managing Element Mesh

• Synthetic Overlay Materials

• Moisture-managing Element Linings

• Internal Support Saddle

Last: Linear Platform- Straight, Strobel last.