You can enjoy a professional foot massage by walking only 15 minutes a day. If you feel headache a few times is normal, it means your feet are too tight, the pain will gradually decrease after wearing for a few minutes, the first use may be painful, adding socks and shortening the wearing time will help you feel better.Sole: Ethylene Vinyl AcetateThe foot massage needle is designed according to the acupuncture points on the soles of the feet. Each massage button can be rotated to each acupoint to relieve pain and tension in the heel and promote blood circulation.Closure: Pull OnMaterial Composition: EVA? Features:1. Promote blood circulation and metabolism.2. Relieve plantar fasciitis, arthritis, arch pain and other neuropathic pain.3. Promote better blood flow to promote overall health.4. Reduce nervous tension and improve sleep quality?Size:36-37EU: suitable for 35-36EU population38-39EU: suitable for 37-38EU people40-41EU: suitable for 39-40EU peoplePlease select the appropriate size according to your actual situation.?Quality assurance:Quality and service are our main goals. High quality and novel design. Every time a problem occurs, our professional team will solve it as soon as possible.