LUXEHOME (YR1609) Lovely Cotton Seamless Unisex Thick Socks for Baby Toddler 80% Cotton, 17% Polyester, 3% Spandex Imported Size S has 6 sets in different designs , each set covers 2 pairs, a pack have 12pairs. But size M has 5 sets(not includes grey set), each set has 2 pairs, total 10 pairs a pack. Excellent material help toddler to prevent his feet from damage. The sweat absorbent function reduces bacterial growth, avoiding mosquito bites. The thick socks keep warm in the all winter. Perfect gifts for the newborn or toddlers. Foot part length:S:11cm, M:13cm. Leg part length: S:13cm, M:15cm. The data are the manual measurement, there is maybe 1-2cm error.