Molehill Infant / Toddler Boot Liner (Boys & Girls) - Adds Extra Warmth Made in USA and Imported Pull On closure Cozy and warm fleece booties liner socks for infants and toddlers Liners provide another layer of added warmth for your little one Add a pop of color with our fold over print designs Recommended to be worn with our Molehill infant/toddler boots, booties sold separately SIZING: Small - 4.5" sole (&lt;1 year); Medium - 5.5" sole (1-2 years); Large - 6" sole (2-3 years). All measurements in inches. Age is only a guide, use sole measurement for best fit.