Very warm for cold days or low activity levels.
Your baselayer is your first, next-to-skin layer and is designed to wick away moisture.
Cozy 2-piece base layer top and bottom set. The wicking fabric pulls moisture from the body to the exterior of the fabric where it can evaporate more easily, creating cooling evaporation. The fleece on the inside also traps lots of air for warmth and the smooth face on the outside is durable and makes it easy to slide on extra layers.