The New Balance 4100 Cushion X-Soles are for people with high arch (rigid) feet that tend to not to pronate (roll inward) at all. This is called a supinated gait cycle which over time, can lead to injury. This insole is designed to help supinators by employing dual-density cushioning in a firmer to softer pattern which helps to distribute the high impact of sports and running. This insole is lightweight and will enhance all brands of athletic shoes and hiking boots.