Cool feet are 4 small ‘feet’ with suction cups at the end that attach to the bottom of your laptop, allowing the heat to be dispersed properly. An added benefit is that in raising your laptop they also allow for greater ease in typing. I think they might also be a safeguard against accidental spills when working at a café.
Not an absolute necessity for travel but a nice accessory to have with you to both keep your laptop cool and create a proper elevation for typing.
Laptop Cool Feet