Conditioner for leather is mostly just hucksterism and gimmick. A spritz bottle of water and a cloth, and your shoes, couch, briefcase, and car seats will do just fine and outlast both of us.
If you've let it go for a long time and it has sun damage, cat pee, or whatever and it's gotten really stiff, then you can use a conditioner with a sponge, but sparingly. Birkenstock is a decent one, but honestly you're better with distilled water and a cloth.
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