Pain Sandals: When you first start wearing these therapeutic massage slippers, you may experience a lot of pain. Because the massage knob is stretching the tight plantar muscles. Please add socks at the beginning and wear them for 3-5 minutes each time. It will take 1-2 weeks to gradually get used to it. Relieve tension: Continuous use of foot massage tools can help improve blood circulation and relieve low back pain; migraines; foot pain caused by plantar fasciitis, arthritis, and neuropathy Portable Foot Massager: A simple way to relax and revitalize your feet at any time, especially after long days at work, wearing heels, hiking HEALTH BENEFITS: Each slipper has 39 built-in massage buttons for acupuncture stimulating massage of the feet, helping to improve blood circulation and body mobility for enhanced overall health Size: Adjustable straps on acupressure slippers allow them to fit most foot shapes. If you are between sizes, please choose the larger size Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store