Frequency Range: 22 Hz - 17.5 kHz Sensitivity: 107 db SPL/mW (1kHz) Impedance: 20 ohms (1kHz) Cable Length: 162cm Price: $125 I was getting a bit over wind noise in my helmet, that and i think i bent my visor a tad out of shape when putting on an anti-fog pinlock insert causing a whistle at anything over 50km/h (ugh). I did a heap of research on isolating in ear earphones and decided on the shure se215 to reduce the additional strain in riding. Firstly, these earphones come with expandable foam ear tips, just like ear plugs you squeeze them, insert and let them expand. This in itself without music reduces a hell of a lot of noise, add a bit of music and you're set. The buds sit along the ear, reducing the chance of any additional hardware getting caught when putting on your helmet (usually). These earphones have replaceable parts, from the ear buds, to the cable, to the ear piece... They can all be detached and replaced as necessary. Great for those of us who tend to destroy or lose gear. Having a whisper kit installed on my helmet can cause me some issues keeping the buds in place when putting on the helmet, but once the helmet is on and the earphones haven't jumped out of place in the process, they're good to go and in place until you remove your helmet. The isolation of noise is great, i can still hear the whine of the engine in the upper range somewhat - however other noises aren't a real concern. I did notice that the music wasn't 'loud', even when set on 90% - but it doesn't need to be due to all outside noise being reduced, you can still hear the music clearly. This allowed for reduced ear strain, while removing outside noise. The 'over ear' cord style does take some getting used to, however this approach keeps the bud in place - big bonus when doing headchecks. The cable is of decent length allowing your music device to be placed wherever you require. Overall, very happy with the purchase - might consider getting rid of the whisper kit to help the buds stay in place when putting on my helmet, don't really need it anymore.