zep483I don't own these (yet), but I do enjoy me some Dekoni pads. . .
The fenestrations allow more airflow, it makes them breathable but it also usually means that they'll sound closer to a velour stock like this. Now, if you want to mod the sound, the sheepskin will offer an improved seal compared to both, which ought to kick things up (or at least around).
GiantHeadphoneSquidYeah, I do like the Dekoni, but I can never figure out fenestrated or sheepskin-depending on the headphone I usually like one or the other. 58x sheepskin wins, he4xx I like both but find the sheepskin more relaxing, on the 6xx fenestrated all day. I'm hoping sheepskin work for 7xx cause they're a lot cheaper.