Polyester,Cotton,MeshMachine WashThe Cute knitted cotton is super soft, breathable, and warm, being excellent to touch; the product is suitable for baby's tender skin.95% cotton 5% Polyester socks. No formaldehyde and fluorescent agent, can be a good protection of the baby's feet.Crafted from delicate fine cotton, Double-Needle Craft, There Are No Extra Lines In The Socks, A Good Protection Of The Baby's Toes.Durable Materials To Combat Wear And Tear, mesh breathable, good elasticity, soft and comfortable, good for the rapid growth in babies.Size: XS(0-6 months)Small(6-12 months), Medium( 1-3 years children)