[metal arms]

The cream sounds a bit unintuitive at first but very dry fungus ridden skin can be prone to cracking - perhaps a creamy substance applied after the foot is clean and dried could help prevent that?  (Wild-Ass-Guessing)

Anecdotally this is what I've found.  It flairs up worse in cracked skin, so moisturise your feet.

[SA Chris]

Cream works. Dry your feet thoroughly before applying.

If it keeps recurring the fungus might be in your climbing shoes and re-infecting every time you put them on.