Details Nicholas Kirkwood "Kristen" napa leather mule. 0.8" flat metallic heel. Peep toe. Pleated vamp with zip trim. Smooth outsole. Slide-on style. Made in Italy. Designer About Nicholas Kirkwood: A Central Saint Martins alum and former associate of Philip Treacy, Nicholas Kirkwood launched his namesake footwear line 2005. The collection instantly earned critical acclaim, receiving accolades and awards for the use of architectural designs and innovative materials. Seeking to fill a gap in the market with statement shoes, Nicholas Kirkwood's quirky but well-crafted designs are anything but forgettable. Heel height may vary by size.