I don't use them. A rule of thumb is, what do you wear on your feet? If you plan on getting into area's where you wear boots to protect your feet, use a CC to protect the coil as well. When you're barefoot at the beach, sand/water can be a problem getting in between the coil and cover, so no cover. I usually go to places where I just wear sneakers (Parks, tot lots, ball fields, old homes) and just use a bare coil.