Black Leather Braided Knot Detail on Upper Gold-tone Accent at Heel Leather Sole Minimalist Heel Nicholas Kirkwood Branding Put a twist on your shoes with the Nicholas Kirkwood Women's Beya Knot Flats. Melded from biodegradable Nappa leather, the flats feature a twisted crossover knot on the upper for a unique silhouette. The leather sole features a gold-tone accent at the notched minimalist heels and elevate the look to another level. Signature Nicholas Kirkwood branding is seen throughout.