When you sit with your notebook in a coldy kitchen, or on a balcony or somewhere outside, you might feel cold. You can try to warm yourself with a regular blanket and more likely it will not work good enough.
Just becouse the trick is that you need to warm your feets in order to warm the whole body. But also you need to cover your shoulders to pretend cold interventing you through your skin.
For this purpose I designed a Tark Tekk - you warm your feets perfectly and you cover your shoulders as well. And you feel yourself just lovely!
Do not waste energy to warm a whole space - warm yourself only!