http://www.etymotic.com/ephp/er6i.aspx
Great for blotting out background noise, chatter, and the TV's in the
gym. Rather than use noise-cancelling circuitry, they concentrate on
preventing external noise from reaching your ear in the first place.
Got them right after enduring a 45 minute chat-a-thon on the machine
next to me. Sound is wonderful and they come with a selection of tips
to fit different sized ears.