Hand-knitted with fancy Italian yarn and plain yarn. I bought it at a shop I found during a trip to Italy. Italian yarn is well-regarded, but it's becoming difficult to obtain these days. How about some colorful fashion for your feet? I think it will make you happy! The bottom is about 10 cm, and the middle is about 14-15 cm. It's ribbed, so it stretches. Knitting experience of over 30 years, instructor.