Women Men Slipper Sandal Reflex Massage Slippers Acupuncture Foot Massager NOTE! The first few times use may be very painful! This is a therapeutic sandal that you only wear for a few minutes at a time. The first few uses may be very PAINFUL. We recommend adding thick socks before getting used to them. If your pain tolerance is very low, this may not be the right product for you! What is the benefit of BYRIVER reflexology sandals? Relieve aches and pains such as headache, migraine, neck pain, backache, neuropathy. Improve blood circulation and energy, reduce insomnia, stress, and anxiety. Helps with plantar fasciitis, flat feet, arthritis, muscle stiffness. What kind of people suit fo these foot massage slippers? People who need to stand or walk for a long time at work want to relieve foot tension. Sedentary people who want to relieve muscle tension. Fitness enthusiasts who need deep tissue relaxation. How do 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 feet. BYRIVER designed acupressure sandals according to the maps of footpoints. Applying pressure to these foot acupoints offers a range of health benefits. Note:the size based on Men Size, Women can chose one small size. For Small - Europe Size 38/39 US Size 6.5/7 Foot Length approx 25.5cm For Medium- Europe Size 40/41 US Size 8/9 Foot Length approx 26.5cm For Large - Europe Size 42/43 US Size 10/10.5 Foot Length approx 27.5cm Upper material: artificial PU Gender: Unisex Sole material: EVA Thickness: ordinary thick Color: rotating gossip, dot prickly Massage Slippers Function: Massage magnetic moxibustion active material both general prevention shoes general four seasons, when the spring raised particles is made, it causes this product to have efficacies of deodorization and antiseptic.