These five-finger socks are made with wool, which provides excellent insulation and moisture-wicking properties, preventing stuffiness between the toes. They also have excellent deodorizing effects and are shrink-resistant, minimizing shrinkage during washing. They are versatile and suitable for travel, everyday wear, and more. I wore them only once and found them a little small and tight, so I'm listing them for sale. They have been gently hand-washed. Would they be suitable for a child? There is one loose thread in the back. See photo 4. I don't think it affects wearability. I usually wear a size S (23cm) and it fits perfectly. I will fold them small and send them via postal mail. Specifications Material: 57% wool + 25% polyester + 14% nylon + 4% polyurethane Average weight: 53g Colors: Tan (TN), Navy (NV) Sizes: S (21 - 23cm), M (23 - 25cm) Features: Tapered shape / L-shaped pattern / Full support fit system / Reinforcement Thickness/Pile: Thin / No pile