Yes, I 100% agree w/
@Allanmarcus. You might be better off trying to get the Brainwayvz velours, if they're available in your area. I imagine the DT770s would get dark and probably muddy with the bass. A lot of people felt that way about the DT1770s, which are a similar (even if more refined) headphone to the DT770.
Also, most of the nice leather pads I've tried (Alpha Pads and Omni Pads, for example), don't breathe as well as a good velour pad. Leather, protein leather and pleather pads also get very sticky when it's hot and humid, unfortunately.
Good luck either way, and let us know what you decide to do.