1.Our children's socks are made of cotton fabric that is durable, breathable and flexible for flexible movement. 2.Boneless stitching and boneless toe construction create this comfortable, smooth sock that prevents annoying irritation or discomfort for most sensory feet.Y-shaped heel design covers both feet. 3. Available in 4 sizes from 3 years to 125 years. Our socks match the size chart. Please choose according to shoe size. Age is for reference only. 4.Simple design kids socks, comfortable and breathable, give boys and girls a cooler experience. 5.Easy to clean, machine wash or hand wash, suitable for spring, summer and fall. Quantity: 5 pairsFabric: 73.5% cotton+ 2.4% nylon+ 24.1% spandexApplicable age: 3-15 years oldSize:M: Suggested foot length 14-16cm, recommended age 3-5 years oldL: Suggested foot length 17-19cm, recommended age 6-8 years oldXL: Suggested foot length 20-23cm, recommended age 9-12 years oldXXL: Suggested foot length over 23cm, recommended age 12-15 years old 1.Our children's socks are made of cotton fabric that is durable, breathable and flexible for flexible movement. 2.Boneless stitching and boneless toe construction create this comfortable, smooth sock that prevents annoying irritation or discomfort for most sensory feet.Y-shaped heel design covers both feet. 3. Available in 4 sizes from 3 years to 125 years. Our socks match the size chart. Please choose according to shoe size. Age is for reference only. 4.Simple design kids socks, comfortable and breathable, give boys and girls a cooler experience. Easy to clean, machine wash or hand wash, suitable for spring, summer and fall.