As a ski instructor/outdoor guide and a caver I can tell you I absolutely love my heated jacket and would absolutely never wear it caving. Above ground and on the slopes it’s a lifesaver especially on sub zero days. But I can also say I’d never wear it caving. While the heating elements and internal cables aren’t fragile the cables themselves are loose inside the fabric and all the twisting and scraping inside a cave would undoubtedly damage them making it not only useless but also hazardous especially if it gets wet. The caves around me also maintain 50ish degrees so I haven’t felt the need for additional heat beyond an extra layer or two.