Suede spring mule, 41

Z-COIL grey suede slip on shoes. I bought these quite hot-headed off eBay while I was trying to get through my fashion degree. I got them in two different styles. Spring loaded, savagely heinous shoe, they're orthopaedic! 

Z-Coils was founded by New Mexico department-store owner Alvaro Z. Gallegos in 1991. As he tells it, he’d begun running four or five times a day to manage his stress after his wife, Marcella, died, and the idea came to him on one of those runs through divine inspiration: “I will never forget that moment,” he writes. “The problem was that they (Marcella and God) did not send me an instruction manual describing how to put the shoe together.” His son Andres joined the company in 1995, and over time, its focus shifted from running to pain relief.

Worn condition but much life left. Size 10 or EU 41.