My 9 year old wore them in 37 degree Tahoe weather and it was very warm. Extremely soft and comfortable, this thermal underwear fits true to size and makes a great base layer. For the record, my son is small, lean, 52 inches tall, about 62 pounds, and is an average fit perfectly with little room to grow. My son loves them so much he wears them instead of pajamas now that we are home.
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