Simon Miller Slice Mule in Green. - size 38 (also in 35, 36, 37, 39, 40) Simon Miller Slice Mule in Green. - size 38 (also in 35, 36, 37, 39, 40) Goat leather upper and sole. Made in Portugal. Leather lining. Square toe with slanted block heel. Approx 108mm/ 4.25 inch heel. SIMO-WZ33. F229-9013. Simon Miller Jeans was founded in 2006 in Los Angeles, California. They strive to provide you with the highest quality denim jeans made right here in the USA. Simon Miller denim is the best quality denim from Japan. The collection consists of selvedge and non-selvedge finishes. The entire production aspect of Simon Miller is based in downtown Los Angeles from the sewing and washing, to the rivets and domes sourced from YKK USA.