The SRS Crash Pad BringsUnexpected Cushioning to this Motion Control Shoe. SRC Impact Zone Provides Shock Attenuation, and the HRC Strobel Board Increases Cushioning. Arch-Lock Provides Snug Midfoot Fit, and the Triple Density Compression Molded EVA Midsole Provides Increased Shock Attenuation, Responsive Cushioning, Stability and Durability While Slowing the Rate of Pronation.