Kids Little Boy Colourful Striped Calf / Knee Socks Pack of 3 (Age 3 to 5) Kids' Pack of 3 Colourful Striped Calf Socks Anti-slip sole on the size small (for 6 to 24 months old babies) Size Medium - For kids approximately 2 to 4 years old; UK foot size 5 to 9; US foot size 6 to 10, Europe foot size 22 to 27; Sole length approximately 13.5-17cm. Size Small - For babies approximately 6 to 24 months, UK foot size 3 to 5, US foot size 4 to 6, Europe foot size 19-22, sole length approximately 11.5-13cm. Cotton Rich, soft and comfortable. Medium thickness, suitable for all seasons.