It's a fact: The pounding foot shock associated with walking can aggravate arthritis pain in knees, legs, hips and joints-- because each step sends a powerful jolt vibrating up your spine. And when you average over two and a half million steps each year - it's no wonder the body's natural defense system is overwhelmed leading to arthritis pain. Constructed of two layers of advanced Enduron foam - specially padded Arthristep Inserts provide extra protection where it's needed most and mold to the contours of your foot for maximum comfort and easy fit. Please specify shoe size. Cannot mix sizes for quantity discount.