Amazon.com: BYRIVER Acupressure Foot Massager Acupoint 。?✔PAINFUL SANDALS: When you first start wearing these therapeutic massage slippers, you may experience a lot of pain. Because the massage knobs are stretching the tense plantar muscles. Please add socks and wear 3-5 minutes a time to start, it will take 1-2 weeks to get used to it gradually. ?✔TENSION RELIEF: Keeping use of foot massage tool can help to improve circulation and relieve lower back pain; migraine; foot pain due to plantar fasciitis, arthritis, neuropathy. ?✔ Portable Foot Massager: An easy way to relax and activate your feet anytime, especially after working long hours, wearing high heels, hiking. ?✔HEALTH BENEFITS: Each slipper has 39 built-in massage buttons for foot acupuncture stimulation massage, helping to improve blood circulation and physical mobility, thereby enhancing overall health. ?✔SIZE: The adjustable strap on the acupressure slippers, make them fit most feet shape. If you are between sizes, take the larger one