Zarpar Women's Fashion Sandals NARA Imported Zarpar sandles are made with special cork material which gives comfort and fresh feeling than standard urethane material. Natural cowhide material prevents your feet from sweating. It also prevents slipperiness. These coated buckles let you adjust the size. Slippery Prevention Outsoles. Natural cowhide material is stronger and more comfortable than regular urethane material. Natural cowhide also prevents your feet from sweating. Natural cork provides insulation, electrical insulation, and elasticity and is very durable. Natural cork is eco-friendly and high-quality material that is lighter than urethane material.