Perfect for checking Silence (among others).

Not easy every day to revise by cutting the ambient noise. This helmet, even if it serves much the head, gradually knows how to forget it even happened to sleep with me by giving me a break.
As other reviewers point out, it greatly reduces noise but do not cancel them. If you focus on one person talking to you, you hear it. But when it comes to focus on a task or to preserve the sound violence, it is absolutely perfect.