These are Akaishi acupressure slippers. I used them indoors at work for about six months. The original price was 4950 yen. They are easy to wear and have a neat appearance. I am selling them because I no longer use them due to a change in workplace. Color: Charcoal (gray) Size: M (23.0-23.5 cm) There is a mark on the inside of the left shoe where the product description sticker was (see photo 8). The following is a product description from the Akaishi website. "The acupressure effect from the bridge structure stimulates the soles of your feet with every step. With three arch supports (inner longitudinal arch, outer longitudinal arch, transverse arch), it firmly supports collapsed arches from the soles of your feet, preventing foot problems. 1. Inner longitudinal arch support: Supports flat feet and foot fatigue 2. Outer longitudinal arch support: Supports O-legs and knee pain 3. Transverse arch support: Supports bunions, metatarsalgia, and Morton's neuroma The instep belt is adjustable, so it can be worn with an optimal fit for high insteps, wide feet, and swollen feet. It won't slip off even when you're moving around doing housework. The material is soft and gentle on bare feet, absorbing and cushioning the impact from the floor while walking." I actually wore them and they fit the arches of my feet, and I didn't get tired wearing them. I think they are a very good product. I think they are still wearable, so why not try them out? Please purchase if you understand that they are used items.