Nine West Women's Outburst Ballet Flat 100% Leather-and-synthetic Synthetic sole Heel measures approximately 0.25" Burst onto the fashion scene with your fierce new flats! Make a statement in Nine West's Outburst flat. This sweet silhouette wins with classic lines and a contrasting cap toe for a fashionable exclamation. A flat grippy sole helps you get good purchase on your day in Nine West. Synthetic Upper.