NEW Kalso Earth Mens Shoes Size 8 Darby Nubuck Olive Green Vintage Style Sneaker. Discontinued on their website!! NEW Kalso Earth Shoes Tie Natural Suede Shoes Style: Darby Size: 8, UK 7, EUR 41 Comprised of 70% Recycled Rubber and Natural Suede As you probably already know, these shoes seem to be sold out everywhere! The original negative heel shoe - Inspired by yoga and deeply rooted in the belief that wellness starts from the ground up. Kalso's negative heel designs are still inspired by the mountain pose - just as originally created by Danish yoga instructor, Anne Kalso, in the 1950's.