Naturalgel has a revolutionary sequential shock absorber construction that absorbs impacts from walking or running, relieving pressure on joints generally, and providing the utmost in comfort. Unique breathing technology in the insoles' TERMOCREP GEL. The gel "The Gel that Breathes." Indications: Pain relief and the prevention of injuries linked to impact-related pain. It is especially advised to protect your lower back, knees, and feet. Breathability: Patented system with a special breathable gel that, when combined with the technological fabric Tecnion, always keeps feet 100% odor-free and dry. Adaptable architecture Sequential non-slip shock absorber Breathable Directions It is advised to measure the insole against the original insole or to cut it one size larger until it is perfectly sized. The images shown are for illustration purposes only and may not accurately represent the specific product.