Back pain? Sore knees or hip problems? The problem could be your feet. Made with artificial leather holes to circulate the air, special elastic, and durable silicone, the Cloud 9 Air Cushioning Insoles provides acupuncture therapy while the massaging mechanisms protect knee joints, hips and lower back. The center of the insole supports the arch to provide a comfortable fit for your feet. The convex part of the insole relieves tiredness while stimulating the feet. 110 special silicon balls absorb shock and decentralize the weight while the air is pumped to circulate. The heel part of the silicon provides excellent cushioning for shock absorption while the special silicon with infrared radiation eliminates odors and allows feet to breathe.