Sam Edelman Bianka Sling Heels Shopbop Sam Edelman Bianka Feather Sling Back in Olive REVOLVE Women's Sam Edelman Bianka Sling 3 Zappos.com Women's Sam Edelman Bianka Sling 3 Zappos.com. As a product expert, I recommend the Sam Edelman Bianka Sling in Buttercup for its sleek lines, small heel and comfortable sling back. These pumps are perfect for any occasion and add a touch of elegance to any outfit. With the Bianka Slingbacks, sophistication and style are guaranteed. Style #: EC0206915 Heel Height: 2. 4 inches Toe: Pointed Toe Closure: Buckle Material: Leather, Fabric, Synthetic Insole: Synthetic Upper lining and sock lining: Peta approved, cruelty free, and ethically sourced