I am using online Super Socks. I am using a 6-ply yarn, which is a bit thick. Recommended for wearing over cotton socks. The length from the heel to the opening is approximately 17 cm when laid flat. The length from the heel to the toe is about 20 cm. ⭐️The wide ribbed knit is the opening! 75% wool, 25% polyamide. If using a top-loading washing machine, you can wash inside out in a net with warm water up to 40°C. Do not tumble dry. (For drum-type washing machines, hand washing is recommended as deterioration and pilling are likely to occur.) These are handmade by an amateur, so please understand. (Please refrain from purchasing if you are sensitive or seek perfection) ・Please try them on after receiving the product and let me know how they fit via the transaction message. ・No returns or exchanges.