Brooks Men's Adrenaline Asr GTX Running Shoe Synthetic and mesh Rubber sole Progressive Diagonal Rollbar - Dual density post engineered to allow for progressive prona DRB ACCEL - Thermoplastic device provides torsional rigidity to midfoot, enhancing suppor GORE-TEX - Waterproof membrane which surrounds the shoe. BioMoGo - The midsole is a biodegradable polymer structure, that is more durable than EVA HPR GREEN - These midsole and outsole components are engineered to set the foot in an eff