Built with 12 springs that cushion and support the foot, these insoles return energy to the body for a "push off" with every stride. Only 1/4" thick, and undetectable until a step is taken, five coils directly under the heel and seven smaller springs under the ball of the foot disperse the impact from walking to help prevent foot and back pain. Honeycomb padding circulates air as you walk to keep the shoe dry and skin healthy. The insoles are covered in bamboo fabric, a naturally anti-microbial fiber that inhibits odors. Dress Shoes Insoles. With a streamlined design that fits comfortably in dress shoes, six springs in the heel, and an EVA cushion in the forefoot. Men's sizes S (4-6), M (7-8), L (9-10), or XL (11-13); Women's sizes S (5 1/2-7 1/2), M (8-9 1/2), L (10-11 1/2), or XL (12-13 1/2).