What harm will flat feet do to you? Due to the lack of elasticity in the foot, it is not possible to stand for long periods of time, to walk long distances, to bounce and to bear weight. How do our arch support insoles help? Our insoles are specifically designed for flat feet, providing support for arch, tightly wrapping the heel. This structure stabilizes the feet, distributes forces, and prevents the heel from swinging when walking, which will prevent tilting of the metatarsal inward, move the weight line from the inner edge to the outer edge of the foot, protecting your feet with your every single step. Ideal for Everyday wear Sore aching feet Plantar fasciitis Flat feet Foot & arch & heelpain Over pronation Metatarsalgia etc. Features: Moisture wicking, sweat absorption and odors eliminating. Feel clean and comfortable when wearing them. Easily trimmed to suitable size, fit most kinds of shoes, work boots, business shoes, running shoes and casual shoes. Kindly Tips: Some users may not be used to using the arch supporting insoles at the beginning, usually they will get used to them within 3 days. We suggest that we need to customers buy 2 pairs or more insoles at a time and use them alternately every 3 ~ 5 days. High temperature exposure is strictly prohibited. If you have any questions or doubts, please contact us at any time.