Thermal underwear is essential
In the Helikon-Tex offer, you will find two types of thermal underwear, which serve as the initial layers of protection against the cold. The first is US LVL 1 Long Johns and US LVL 1 Top. They wick moisture away from the body thanks to the Quick Dry polyester fabric and also have flat seams for added comfort. This is basic insulation against light cold.
For lower temperatures, a second layer of thermal underwear is needed, like US LVL 2 Long Johns and US LVL 2 Top. These are made from a soft, quick-drying Comfort Dry material and provide additional thermal insulation. The US LVL 2 Top also features a turtleneck design and is zip-adjustable. Thermal long-johns and a comfortable top are the best start if you want to dress in layers.