so true, skull candys are aucutally not a very good brand, Check out their specs their frequency range isent that great either, One of the main things i look for when buying headphones is how the cord is attached, the connection between the headphones and the wire and the wire to the device needs to be strong (thick), flexible becuase sooner or later your gonna fall.
Seriously the best headphones for riding are just the regular in ear kind, preferably noise canceling ones. People rock Skullcandy because its flashy, not because it sounds good, people who rock their expensive AKGs or other studio monitor headphones are risking breaking them, i know because i broke my AKG Parabolics a few years ago when rocking big headphones was the only way to go.
Just get a nice pair of low profile in ear headphones with noise canceling tech.
I think you might be referring to noise isolation (i.e. earbud creates a seal in the ear canal to block out outside noise). I wear Sennheiser CX400 earbuds on the slopes. They're durable and they don't stick far out of the ear so if I fall on the side of my head (rarely), it doesn't hurt. I can sleep in these...
But yeah skullcandy products blow. I've had two die on me (smokin buds and FMJ) in 5 months. Sound was bad too. Budget earbuds I'd recommend are JVC Marshmallows and 2XL Spokes (2XL is made in the same place as Skullcandy, but they sound better for whatever reason). Both can be found for around $10.
These earbuds are amazing. I had heard a ton of good stuff about them so i got a pair and WOW they are great. FYI if you are into deeep deep bass, etc and like to get headaches these aren't for you. Oh and did i mention that they block out sound like no other? Seriously you can't hear anything when you turn it up a bit with these in.