Midweight Base Layer Set (Youth 7-14)Description Youth Winter Base Layer Top & Bottom Set. Midweight fleece warmth and breathable, sweat wicking performance. Keep them warm and riding on the mountain with this Kids' and Toddlers' Burton Midweight Base Layer Set. This is the midweight base layer set kids can wear for the coldest days of the season. Breathable and quick drying, it regulates their temp through different activity levels and lets 'em bend, flex, and play with full mobility.