THICK & WARM!43%Polyester,30%Acrylic,18%Nylon,6%Wool,3%Elastane, without formaldehyde for these toddler girl socks. HIGH QUALITY COTTON SOCKS! With high-quality and soft wool blend, these toddler socks are warm and gentle on baby's feet. SEAMLESS & COZY! These boys and girls seamless socks feauring boneless sewing toes and reinforced heel for extended wear.Cushioned heel built-in arch support,creates a more comfortable fit on the foot. BREATHE FREELYThese socks for girls and boys are absorb sweat, keep skin cool, dry and light, comfortable for both indoor and outdoor activities. HAND-WASH AND MACHINE WASHABLE NOTICE: high content of cotton in the socks will be a little shrinking when washing it. After drying, tensile it will eventually stretch back out.