Functional underwear or thermal underwear in winter is the foundation for a comfortable body temperature and a healthy body climate during any outdoor activities such as winter sports, hunting, or working outdoors. We have compiled important information about functional underwear here.
To dress properly in cold temperatures, clothing must not only be warm but also breathable. This applies to both underwear and outer clothing. Even at low temperatures, the body produces sweat, which must be transported away from the skin, especially as activity alternates between rest and movement. This is particularly true when hunting, which is why thermal underwear is essential gear for hunters. Functional underwear made from synthetic fibers or wool absorbs moisture and allows it to evaporate, ensuring a pleasant body feel.
Depending on the temperature, personal cold sensitivity, and intended activity, it is advisable to combine several layers of functional clothing. This way, cold protection can be adjusted even with changing weather conditions or body heat. The most important foundation is the functional underwear, as it lies directly on the skin. High-quality manufacturers specify not only the material but also the material thickness and weight of the underwear. As additional layers, a weather-resistant jacket as the outermost layer and a fleece jacket as the middle layer are recommended. Depending on the temperature, the layers can be supplemented further.
With thermal underwear, it is crucial that it fits snugly against the body. Only in this way can the baselayer absorb sweat, direct it away, and ensure a dry body feel.
The best materials for functional underwear are merino wool and polyester. Cotton-containing blends are only sensible if the cotton content is relatively low. If the cotton content is too high, the underwear is no longer breathable. When designing the underwear, it is advantageous to use different materials and material thicknesses in various body zones. The advantage of polyester over wool is that the fabric is very light, dries quickly, and is breathable. However, polyester also tends to develop odors. In contrast, wool is odor-neutral and very warming. The disadvantage of wool is that it does not dry as quickly as polyester. However, with merino wool and polyester, one is always well advised and should decide based on personal preferences.
