These boots will keep your feet warm even when flying in freezing air. Made from a durable and watreproof material, worn on your comfy shoes, they stop the cold air from direct contact and eliminate the heat radince. With a comfortable side zipper and additional top laces, its very asy to put them on or of. Moreover, in case of warmer conditions, it is possible to take the insulation out of the shell and use only as a wind stopper as well as easily machine wash them. 
Warm, smart and practical. Thats what our boots are.