OK, so at the risk of being unpopular, I will tell you a sure fire method for all clients who have a huge cracking and callus problem, as well as, for the client with not much problem at all. Sallys' Beauty, (who we pros do not use often because they sell to the puplic) but they have a foot file called a CHECHI' FOOT FILE (medium grit, only the medium) it comes in a pro version, (larger purple handle) and it comes in a smaller medium grit with a creme colored handle. I LOVE LOVE LOVE, the one with the creme handle. If you instruct your clients to file a tiny (TINY) bit each day. ONLY with their feet DRY!!!!! The secret is that the feet must be dry. it will file like sand paper with very little stress to the skin (which is what causes callus to become even worse) It will improve tons right before your eyes. And almost all your clients will want to go home with one. (retail for two times your cost) I use HEMP lotion (by Supre) which I understand is expensive in UK but well worth it. I love the stuff and it works a charm. Most of the "cremes" for callus have Salacylic acid as their active ingredient which is very caustic (ie: ACID), and to me, does not work very well long term. You will have some of the happiest clients in the land, and they will return with soft feet which will make your job easier. Just be sure to tell them not to over do because it will take too much! I always tell them that a little dab'll do.:green::green::green: