The Superfeet GREEN is our most popular insole and has been on the market for 35 years. It is designed primarily for footwear with a removable insole and is the recommended choice for those seeking maximum support and shock absorption. Recommended foot type - For feet with a medium to high instep RECOMMENDED FOOTWEAR - Running, walking, hiking, alpine, industrial, and military footwear. AVAILABLE SIZES - A-H | 35 to 50 European