We know that the key to staying warm in winter is staying dry, which is why we like the Burton Lightweight Baselayer Set. The DRYRIDE Ultrawick fabric is lightweight, moisture-wicking, and quick-drying, sealing in some extra body heat while keeping our kids drier-on and off the mountain. It also lays softly against their skin, keeping them comfortable when they want an extra next-to-skin layer for winter warmth.