My little one loves her new thermal underwear. We've only tried lilac so far, but it seems quite decent. I definitely recommend ordering on the large side; She is pretty average 4 years old and we chose 4/5. While the sleeves and pants are a bit long (as I expected), the shirt is pretty tight, which is what you need in a thermal. However, if I went smaller, it would be too tight. Overall very happy with this product.
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