The Long Johns with Fly 200 are produced using a circular knitting process, which eliminates the need for longitudinal seams and significantly enhances wearing comfort. The air trapped between the fibers reduces heat exchange within the material, providing insulation against incoming cold. With a fly. Woolpower 200 This lightweight functional underwear is designed to be worn directly against the skin as a moisture-wicking base layer. This is where Woolpower products truly shine, as the material maintains the body's thermal balance while simultaneously transporting sweat away. This thermal underwear offers optimal cold protection depending on activity levels at temperatures ranging from +10 °C to -20 °C. Ullfrotté Original This is a knitted terry fabric, with one side being smooth and the other made of terry loops. The airy terry loops combined with the crimped structure of the wool create a jersey knit that traps a significant amount of air, resulting in excellent insulation properties. The thicker the layer of air next to the body, the less body heat can escape. • Details: - Ullfrotté Original, 200 g/m² - Extended back section - Knitted cuffs • Type: Long underwear • Material composition: 60% wool, 25% polyester, 13% polyamide, 2% elastane • Size information: Size runs true to normal • Fit: Regular cut Material • Material type: Merino wool Features • Seat padding: No • Compression: No • Thermal function: Yes • Special features: Antibacterial Care instructions • Washing: 60 °C normal wash cycle.