The Kombi RedHEAT Extreme Zip men's baselayer long-sleeved shirt lives up to its name with optimal body temperature regulation. The innovative technical fabric stores and manages body heat for maximum comfort, making it the perfect thermal base layer for people living in extreme climates. Thanks to the RedHEAT superior moisture management, this first layer will provide the most enjoyable experience for any winter sports, such as alpine skiing or snowshoeing. This garment is part of a layering system that provides comfort and warmth for your outdoor activities. Easy to layer, this base layer enables you to regulate your body temperature by wicking moisture away. This onion layering system is made of three types of clothing. The first layer, worn next-to-skin will provide warmth and quickly move moisture away from your skin. Then, the second layer, is the insulation or fleece, that provides warmth while also dissipating heat during periods of high output. And finally, the third layer, the shell, which is the most weather-protective layer, worn on the outside of all other layers.