Odlo The I-thermic X-warm Base Layer Bottoms + Rechargeable Battery

"Designed for winter athletes who like to stay warm, Odlo's I-Thermic X-Warm Base Layer Bottoms feature innovative heating technology that can be controlled from your smartphone. This functional underwear is perfect for a wide range of winter activities, from skiing to leisurely après-skiing. Thanks to the sensors integrated into the fabric, the heat is distributed specifically in the most important thermal zones. It is controlled via the Clim8 app, which allows you to adjust the temperature exactly to your preferences."
"Even if you are out and about without mesh coverage, you can manually adjust the heat settings via the rechargeable battery, which is stored in a special pocket. The I-Thermic X-Warm Base Layer Bottoms not only offer intelligent thermoregulation thanks to the organic body mapping, but also full freedom of movement and improved moisture management. With this base layer bottom, you don't have to pack extra layers and can rely on optimal comfort for all your winter adventures."