These Superfeet Merino Grey inserts are designed to be perfect for running around in the cold. Recommended for those with medium to high arches. These Superfeet insoles use a high-density foam construction that helps them keep their shape and deliver reliable support and comfort. Deep heel cup provides extra cushioning and support for repetitive impact. Superfeet Shape has a higher profile silhouette that provides added stability to reduce stress throughout your legs. Felted Merino wool top fabric gives you extra warmth. Designed to eliminate odor-causing bacteria to keep your feet feeling fresh. The base of the insole increases support for the rear of your foot to add even more stability. 100 percent man-made materials. Imported.