The function of the insoles: The soles of our feet have a high concentration of nerve endings and about 60 reflexology points. 34 magnets massaging your feet cavities, stimulating your feet reflexology points. Relax muscles, reduce shoulder pain, back pain and knee pain. Improve blood circulation Improve cerebral circulation Promote cardiovascular health Activate breathing Strengthen the autonomic nervous system- solar plexus (reduce stress and anxiety) Promote heart and liver health Strengthen and support spine Improve sleeping quality and reduce headache Increase libido Relax the abdomen and aid digestion, help weight loss. How to use these Sufoot Magnetic insoles: The insoles are designed for use in footwear such as: trainers, running shoes, hiking shoes, wellies, walking shoes, work shoes, ankle boots, and knee-high boots. Suitable to wear everyday. Adjust size and shape by trim guide on the insole or your existing insoles 30mins on 1st use, add additional 30mins each time to allow your feet to gradually gain comfort with the insoles. Wear for at least 3 weeks to feel the full effect. Foot Reflexology Card Included: Professional foot reflexology information and instruction are included with each Sufoot Magnetic More Insoles If you don't receive the black foot reflexology card, the product is not genuine Sufoot Magnetic More. Quality Guarantee: Sufoot ensures your insole quality. If you have any problem, let us know anytime. Your satisfaction is our top priority.