Our Soft & Healthy Height-Boosting Insoles contain 10% fabric, 80%EVA and 5% latex. It can reduce sports fatigue, improve sports health, and prevent arch deformation caused by long-term exercise. Soft and gentle material, can solve the problem of hard feet, and can massage and soothe the feet. Its use method is very simple: first measure the length of the foot, find the auxiliary cutting line slightly longer than the foot, use an old insole, fit your foot to compare the length and cut it, and finally put the product into the shoe. It can promote height growth, correct collapsed arches, relieve varicose veins and foot pain, improve body posture, and promote blood circulation.