Brooks Men's Adrenaline ASR 100% Synthetic Forefoot and Heel Hydroflow for enhanced cushioning PDRB, a dual density post, slows the rate and degree of pronation Full-length Substance 257 midsole offers unsurpassed cushioning and durability Wanganui Softshell microfiber upper moves moisture away from the foot and regulates body temperature HPR Green enhances traction, offers a softer and smoother ride