I don't know about leather protectors, but there are various types of boot covers. Some are just a very thin stretchable fabric (e.g., Lycra), which limits somewhat how much protection they give. Sold in many pro shops, and on-line. But I was taught that ice dancers should push the underfoot in crossed positions to the point that part of the top of the boot slides against the ice. It does protect against that pretty well, though eventually they wear out. But my boots are old enough, and scratched enough, that I mostly don't care now.
Some boot covers have been thicker neoprene. It has an additional plus - or minus, depending on how cold your feet get, and how much they sweat, and other comfort issues - that it keeps your feet warmer.
But of course, if you are training to have very close feet (sometimes called neat feet), anything thick could get in the way. Even with the thin stretchable Lycra and boot covers, I sometimes have caught the blade on one - but I guess it could catch just as easily on the boot.
Since leather doesn't stretch as easily, it would be harder to make fit. But if you are good at working with leather, or know someone who is, I don't see why you couldn't try.
BTW, some people instead wrap their boots in removable tape. E.g., see
https://geppettosskateshop.com/boottaping for a way of doing it that looks neat enough that you could maybe skate a program in it, and use it to change your skate color. Maybe avoid duct tape - it sticks too well.
Topic: how do you protect your skates during training (Read 1403 times)