Knitted with German Opal wool yarn. These socks are knitted with a thick, 6-ply yarn, making them thicker and warmer than other socks. They can be worn with shoes. When wearing Utsubo socks, I was concerned about my ankles getting cold and the opening becoming slightly loose, so I added ribbing. The double-layered ankles are not only warm, but the ribbed part of the ankle is held by the Utsubo's "mouth," so they don't constrict but are still difficult to slip off, providing a comfortable fit. I wear this type of sock all the time. I hope you'll give them a try. Foot size: 22-24 cm Length from heel to opening: 11 cm 《Yarn Used》 Opal Yarn Rendezvous KFS161 Opal Yarn Solid Color 5192 Wool (Superwash Wool) 75% Nylon 25% After creation, they have been washed with Emal. Warm water up to 40°C can be used. They can be machine washed in a laundry net. It is better not to use fabric softener for longevity. Bleach and tumble dryers cannot be used. I made these with care, but as they are handmade by an amateur, I would appreciate your understanding. Due to hygiene considerations, returns are not accepted. Thank you very much. #OpalYarn #opal #Martina #SockYarn #HandKnitted #HandKnittedSocks #Handmade #UtsuboSocks #Yukurea'sWork