Meet your new best friend for winter, the Sally Hansen La Cross Foot Smoothing Disk.
It sort of feels like an air hockey puck with ridges, but man, that angled exfoliating action works. Just rub the disk gently along the edges of your heel (or wherever that calloused buildup happens). Afterward, you can see all your dead skin in the ridges (gross but satisfying), and it washes out easily under the shower. So your feet are fully clean. Not to mention smooth.
For just $6 at any drugstore, you’re all set.