Our Thermalwool ® Garments have been designed as a first layer garment to be worn closet to the skin. The most important purpose of this layer is to keep your skin dry. Moisture next to the skin causes rapid cooling, so the garment must act as a good insulator to prevent heat being conducted away from the body. This garment has the ability to transfer moisture away from the skin, yet it absorbs very little moisture so it is fast drying.