They are light and comfortable BUT it has an accentuated (but not pleasant) low end, severe lack of mid and high frequencies.  Sounds like you're in a "boom tube".  Very disappointed.  I've been looking for a pair of "flat" realistic sounding headphones.  The cheap pair that used to come with a Walkman years ago are much better than anything I've found so far recently.  Also, as someone else stated, these headphones have very poor sensitivity.  Need the volume raised way above the point needed for any other headphones or earbuds that I have tried