Kalso Clogs in black leather Size 8. Convertible strap. Like new condition; worn once. Original box. The original negative heel shoe. KalsØ Earth® Shoes, the original wellness shoe, was originally designed by Danish yoga instructor, Anne KalsØ. Every KalsØ Earth shoe is based on the popular yoga "mountain pose" and makes wellness part of the everyday. Whether it's a KalsØ Earth sandal, clog or flat, each style helps to naturally improve posture, strengthen core muscles, and reduce joint stress.