Pease check your children’s shoe size for the socks. Size 4 Years -7 Years is equivalent to UK Kid Shoe Size C8 - C13. Size 8 Years - 13 years is equivalent to UK Shoe Size UK 1 - UK 6 , Coolmax fabric to wick sweat away and help keep feet dry and comfortable. Compression fit and zonal cushioning help blood circulation, Comfortable Ribbed cuffs for the best fit, Ankle support for a snug secure fit and reduce injury , 100% Coolmax , Machine Wash , ZQ-KID-RD-C8 , Arch bandage provides gentle targeted support,Mesh inserts on top for ventilation , Reinforced heel and toe for enhanced durability, No-slip heel fit with a Y-stitch heel pocket keep you kicking not slipping , Anatomically placed cushioning for support in high-stress areas