I live in the meeting, I had for almost 2 years heavy use of the helmet in the pool and at sea. I also use it for sports such as jumping rope or cross did. Indeed the band was too big for my head so I shortened (cut) of at least 5cm on each side. I put the rubber after termination and nickel! More cap problem. This is by far the most stable and efficient waterproof headphones that I could have (I had 3 other different brands)