For core training and posture correction! One-tooth geta that corrects posture just by wearing them. For those concerned about pelvic misalignment, poor posture, core training for sports, and balance. Free size? Geta, one-tooth geta, traditional Japanese footwear, Hiraiya? Simple, Japanese footwear. Thank you very much for your interest in the product. My elderly father purchased these, but they are no longer needed, so I am selling them. These are used items, so there may be dirt and scratches. Please refrain from purchasing if you are sensitive to such imperfections. Please examine the photos carefully. Everything in the photos is included. The measuring tape is not included. The item will be shipped via Takkyubin (courier service). Thank you for your understanding. Seller's use only: 12199934