As a new mom, I was looking for something that would keep my little one warm at night underneath her sleep sack.  This fit the bill!  Not only did it keep her warm in the winter months, but it kept her cool as the weather got warmer.  I used it primarily as pajamas, but it also worked during the day.  I was impressed at how long she was able to wear the garment; even though she was growing quickly, she was able to wear it for a few months (unlike most of her other clothes).  Great product.