I'm 68 and first suffered from deep heel cracks in my teens that were so deep they bled when I walked. The GP referred me to a chiropodist who cut off the calluses and told me to always moisturise my feet after washing them.
While I was still limber enough to reach my own feet I was able to keep the hard skin under control with a file and lashings of diabetic foot softening cream.
Now I am unable to bend that far, so I have to pay a podiatrist to come and trim my toenails and file my feet every 8 weeks. I can barely walk, normally managing around 1500 steps/day, yet big calluses would still form on the outer side of my left big toe, and along the tops of the three smallest toes on both feet. Even with the foot fettler carving them off every couple of months they were a constant annoyance.
Then I got a pair of alpaca bed socks for Christmas. I woke up the first night with my feet feeling very hot, and also as if they were being scritched by a nylon pot scrubber. So I kicked them off and went back to sleep. It was so cold the next night that I tried them again, and stuck my feet out from under the duvet when they felt hot.
When the podiatrist returned in early February she asked how I had managed to get rid of the calluses, because there was hardly any dead skin for her to trim. When I said I'd been wearing alpaca bedsocks she said she'd heard that they were good for cracked heels, as well as being excellent for heat regulation and not getting stinky.
When she came back last month she noticed that I no longer have calluses on my toes. Making her job much easier because she now only has to clip my toe nails without any bothersome slicing and grinding.
I haven't even been slathering my feet with cream before putting the socks on, just the normal slapping at them with a long handled lotion dispenser after I get out of the shower. I wish I'd known about the foot smoothing properties of alpaca socks 50 years ago.