Sonic Defender
Headphoneus Supremus
IME if you're wearing closed headphones in any kind of warm(ish) environment,
or while moving about,
they'll get pretty hot inside the ear cushions.
The V Moda XS, Beyerdyamic T51p, and similar headphones with small ear cushions
make for a much cooler ride.
I know, that is why I bought the XS! Not to mention, love NAD, have owned several pieces of NAD kit over the years, including my current M3, but the HP50s were just to goofy looking for public wear. At first I didn't think so, but over time I just couldn't wear them without feeling self-conscious. Shame, great sounding headphone that does nothing really wrong, and several things really right!