The Georgia Comfort Core Five (CC5) removable insoles are designed with ergonomic arch support for a fit that is both supportive and incredibly cushioning. Foot fatigue is a thing of the past when you add these inserts to your favorite pair of boots, thanks to special airflow channels located on the bottom of the insoles; they push air toward your foot bed with every step you take, so that you stay cool and relaxed no matter what is next on your list to tackle. 
Specifics 

• Airflow channels provide cool circulation 
• Ergonomic Arch Support relieves foot fatigue and provides added comfort 
• Replacement for style 8515CCI 
• 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