Hi Satt, You may notice that the sizing on tabi (both indoor and outdoor [jika tabi]) aer not like other typical shoe sizings. In fact, they start at 23 and go to about 33, so looking for a size 11 may be a frustrating thing.... To measure yourself for tabi, simply take a tape measure to your foot (from the end of your heel through to the end of your big toe), and find that measurement in centimetres. That's your size! For example I am a size 28. You'll find that that measurement style is pretty universal for tabi, pretty much wherever you get them from, so once you find your size, you'll be set and safe to order from whomsoever you prefer.