I carefully knitted this. I am certified as a hand-knitting instructor by the Japan Knitting Culture Association. Currently, I am a handmade amateur, a full-time housewife. Please understand. Materials: Domestic manufacturer's products 100% pure wool With lame Acrylic Assorted Size: 23 cm Approximately 0 cm of stretch There is no feeling of tightness. You can wear it over socks. I also twist the yarn by hand, so it has a soft texture. I would be happy if you could appreciate the quality of hand-knitting.