Our CC8 Comfort Core® Next Gen memory foam insole has a cushioning polyurethane base layer featuring individual Comfort Core® pillars that flex and absorb shock with each step. The top layer of memory foam conforms to your foot, giving you a supremely comfortable, customized fit. Airflow channels promote air circulation within the boot as you walk. For best fit, this replacement insole should be used in Georgia Boot product that is designed with the CC8 Comfort Core® Next Gen memory foam footbed. - Memory foam adjusts for customized cushioning for the entire foot - Polyurethane layer for maximum cushioning - Airflow channels provide cool circulation - X Large fits U.S. Men's sizes 11 - 12½ - Medium fits U.S. Men's sizes 6 - 8½ - Large fits U.S. Men's sizes 9 - 10½ - 2X Large fits U.S. Men's sizes 13 - 14½ - Individual shock-absorbing Comfort Core® pillars