French fashionistas Avelana and Roudière have developed a new smart fabric dubbed Klimeo that can regulate wearer temperatures based on surroundings. So if it’s hot, it can make you cooler and if it’s cold, it can make you warmer.
It works by grafting a system of nano-capsules into the woolen material. The capsules insulate and release heat by changing from solid-to-liquid depending on external temperatures. Who knows if it’ll actually work, but I’d love to give it a shot.