I purchased this product in a store and on the advice of a salesperson. I was looking for a new headset to listen to my MP3 player without being bothered by the noise of the street and mainly cars. It is marked that the helmet against noise. C'mon! Yes the sound is a bit muffled, but this is insufficient in view of the sound quality. I put the MP3 player in depth and yet I almost could not hear anything. I do not listen to music or very little. I use my MP3 player to listen to spoken mostly people and I could not hear anything except when there was no noise. At least I will not be deaf risuqe with this helmet!
Having lost Botie my old helmet, I had the good ied to see if the there was no information on the product. So I bought the MMSE because I know that with a Sennheiser 205, I will hear without interference by noise. Even if it bothers me after about an hour listening to the right ear.
Avoid it for its lack of isolation and its poor sound. 16 euros thrown from windows!