Whether you're in the city, on a trail, or by a stream, merinoGREY keep your feet in comfort. We combined the natural thermoregulating properties of Merino wool with Superfeet's standard for support and performance. merinoGREY add structure to any roomy boot, shoe, loafer, or other work or casual footwear that may lack the support your feet need to perform their best. The thick pile of our 90% Merino wool top cover lays over the supportive FOUNDATION™ foam and Encapsulating Stabilizer System [ESS®], so you're supported, aligned and comfortable. RECOMMENDED FOOT TYPE Ideal for feet with medium to high arches. RECOMMENDED FOOTWEAR Roomy sportsman, hiking, walking, ski, snowboard, industrial, casual or military boots and shoes.