Monster iSport Immersion. Great for the gym because they seal out noise, waterproof, and will not fall out of your ear. However the fin does hurt your ear after a while so I can't really use it for much else. Now I'm in the market for a pair of study headphones that will keep out decent amount of noise if I were to study at the library. I was looking at the Bose AE2. They seem to be very light and comfortable to wear for an extended period of time. the m20's are rated so high but they seem kind of heavy. Can someone who owns a pair tell me how they are comfort wise?