Warm them in the oven or microwave, rest your feet, and relax. Hand-carved blocks of Himalayan salt emit negative ions that cleanse and purify. (The Europeans know all about salt therapy; some salt spas have been in operation since the mid-19th century.) Each foot-shaped block comes in a terrycloth sock; the set arrives in a cotton canvas carrying case with zipper top and handles. Each block is 4½' wide, 11' long, 1' thick.