I found this post on xdtalk.com. It is from Mark Craighead. the owner of Crossbreed Holsters.
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Your holster is made from a combination of cowhide or horsehide and a space age thermoplastic called kydex. To care for the leather portion of your holster, simply treat it once every four or five weeks with a good leather conditioner. Use a cream type product on the front side of the leather as some oil based conditioners may lift the dye. The kydex portion of your holster will simply need to be wiped down with a damp cloth as needed.
DO NOT use ANY oil based product on the front of a dyed holster, period.
Don't make more of the conditioning thing than it is, it's not that critical uness you are in a really dry climate.
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Mark Craighead
Owner/Founder--CrossBreed Holsters LLC
Owner/Founder--CrossBreed Firearms Academy
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I ride a morotcycle so I have alot of leather..jackets, chaps, gloves, etc but what I use is made especially for them. Conditioner and weather treatment. I have not put anything on either my Crossbreed or MTAC. At least not yet.
Hope this helps