Thermal underwear for children is an invisible, but very important element of children's ski clothing. It not only protects against cold but also wicks moisture away from the body surface, providing thermal comfort. As with adult clothing, a layered clothing system works best for children during outdoor activities. Its basis is children's thermal underwear. It is the one that has constant contact with the skin, provides it with a comfortable temperature, and is responsible for wicking moisture away during exertion. Children remain in constant motion, hence it is so important to guarantee them high-quality thermal clothing that will meet extreme challenges. Equally advanced materials are used in children's underwear as in adult models. This translates into excellent usage properties. Properly selected junior ski underwear is particularly important in the cooler part of the year. A slightly thicker thermal shirt and well-fitted leggings under pants will make every ski or sledding outing a pure pleasure. Top children's ski underwear is a guarantee that a young winter sports enthusiast will be effectively protected against low temperatures, and at the same time will not overheat too easily.