Ideal for cold days. They are usually worn over cotton socks to avoid scratching. I'm sure it will keep our little ones feet warm in New York winter when our kids go for walks in inclement weather. Bought X-Small for our little one who fits up to size 12 (five years old). On average, buy the same pair hoping it will grow on them over time. We'll be able to transfer this pair as it's really worth it.
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