I purchased the ER6i earphones primarily for use while motorcycle touring. I ride a sport-touring bike with a full face helmet. The low profile of these in-ear earphones allows a really nice fit under the helmet. Sound quality completly meets my expectations and matches units costing significantly more. The solid fidelity of the earphones combined with the noise reduction offered by the in ear design eliminates the need to really "crank up" the i-Pod in order to hear the music. I am very satisfied with these earphones and recommend them highly!