Marusho Wa no Ito (Japanese Thread) Nagomi no Ito (Soothing Thread) Silk Five-Finger Socks Black Silk 95% Nylon 3% Polyurethane 2% The size is indicated as 24 x 26, so I believe it's approximately 24-26cm. According to the description, it has sweat absorption, quick-drying, and deodorizing effects, eliminating stuffiness, stickiness, and unpleasant odors. It also mentions a crisp, refreshing feel, leaving the spaces between the toes and heels smooth. It is thin, so it can be worn as a layering sock. When taking photos, I tore the outer bag when opening it, so I've replaced it. Please understand that the item will be shipped with water damage protection and simple packaging. Thank you very much.