To keep children as comfortable as possible in the cold winter weather, we’ve learned to love layers. Especially those with wool: natural wool gives the best warmth without weight and warms you even when it's wet. Combined with moisture-managing lyocell, it's so soft and warm you could wear it all the time. The Kinsei base layer set is a great choice for the Arctic cold. Many parents choose this Reima best-seller as all-winter wear for their toddlers who don't yet run around and thus need more warmth than busily playing kids.