The sound is clear and I dont hear whats going on around me when Im using it. Don?t know how we lived without them. We had two of them, the other is still working fine. Ordered a medium which is my size - 116 pounds, 55". -- Straps could use a sternum buckle. Ill start off by saying Ive never owned a pair of Puma shoes before. Man wird auch relativ nervig darüber per E-Mail informiert. It was not worth keeping, so we gave it away and bought a very well made, more roomy, sturdy cabinet from IKEA that was not much more than this piece of garbage. Also, the couple of times Ive used it near people, its been a conversation starter. Ive used NIVEA products for years and never had a problem.