CAUTION: THESE ARE NOT COMFORTABLE SLIPPERS!!! Some customers complained that these massage sandals are hurt to wear, it generally because feet tension or never tried similar product before. That is a usual situation, we suggest adding socks and start with a few minutes only, this discomfort will be disappeared after 1-2 weeks using. If you are zero pain tolerance, these may not a good product for you!!! What is the benefit of BYRIVER reflexology sandals? 1. Improve blood circulation, sleep quality, nerve sensitivity 2. Relax tense feet, reduce stress & anxiety. 3. Helps with plantar fasciitis, flat feet, arthritis. 4. Relieve aches and pains such as headache, migraine, neck pain, backache, neuropathy. What kind of people suit for this foot massage slippers? long standing or walking workers who want to ease foot tension. Office worker who want to relieve muscle tension. Fitness people who need deep tissue relaxation. Elderly people who want to improve mobility. How does BYRIVER reflexology sandals work? Reflexology is a type of massage that involves applying pressure to the feet, hand, and ears. In Chinese medicine, different body parts correspond with different pressure points on the foot. BYRIVER designed acupressure sandals according to the maps of foot points, applying pressure to these foot acupoint offers a range of health benefits.