The inspiration came from Spanish embroidery and a long-held tradition of leather working. Hierro means iron or brandmark. Every hacienda has its own logo and these sunglasses are 'branded' in metal either with a Theo or Tim Van Steenbergen emblem.
Each frame is named after a Spanish patron saint: above is Isidro, and below, Jaime and Mercè. Neither leather nor embroidery is actually used but it looks extremely convincing.
