Size X-Small: Fits for kids shoe size: US: 8-10 EUR: 24-26 (3-5yrs); Size Small: Fits for kids shoe size: US: 10-13 EUR: 26-31 (5-7 yrs) Size M: Fits for kids shoe size: US: 13-5 EUR: 31-37 (7-10 yrs); Size L: Fits for kids shoe size: US: 5-8 EUR: 36-39 (11-15 yrs) Material: Made with World Finest Viscose Bamboo; It is softer and smooth than cotton. Comfortabl & Breathable: Bamboo-Viscose is extremely soft and smooth,premium breathable, skin friendly. Give your kids a cozy warm feel, they will not want to take it off! Ultar-high quality: The kids socks have high elasticity, socks will not deform and harden after repeated washing. Perfect choice for kids with sensitive feet. Occasion: Your kids could wear these casual socks whether indoors or outdoors. Perfect for sports, school, play, and daily wearing.The best gift for your son,daughter, your friends' toddler boys and girls. Material:Made with World Finest Viscose Bamboo; It is SOFTER and SMOOTH than cotton. Size X-Small: Fits for kids shoe size: US: 8-10 EUR: 24-26 (3-5yrs); Size Small: Fits for kids shoe size: US: 10-13 EUR: 26-31 (5-7 yrs) Size M: Fits for kids shoe size: US: 13-5 EUR: 31-37 (7-10 yrs); Size L: Fits for kids shoe size: US: 5-8 EUR: 36-39 (11-15 yrs), Comfortabl & Breathable: Fabric is extremely soft and smooth,premium breathable, skin friendly. Give your kids a cozy warm feel, they will not want to take it off! Ultar-high quality: The kids socks have high elasticity, socks will not deform and harden after repeated washing. Perfect choice for kids with sensitive feet. Occasion: Your kids could wear these casual socks whether indoors or outdoors. Perfect for sports, school, play, and daily wearing.The best gift for your son,daughter, your friends' toddler boys and girls.