Among the new technologies on the DW (shown) are chamfered edges and a solid outer shoulder to enhance dry performance and what Continental is calling Enhanced Groove Curvature in the tread to improve water evacuation for better wet handling. One cool feature is the new Tuned Performance Indicators. These are visible letters built into the second rib of the tread to let drivers know of the tire's optimal performance levels. "D" indicates the tire's at optimum tread depth for dry conditions, "W" for wet. When they disappear, the tire is no longer tuned for optimum performance in that particular road condition.