Excerpt: Our first impressions of the Adidas Sennheiser PMX 680i earphones weren’t great. For one thing, the packaging is ridiculously excessive: not very green. Visit Group test: what are the best headphones?
Conclusion: Testing I used the Sennheiser PMX 680i Sports while cycling around country lanes, sea kayaking and during two one hour gym sessions. While cycling I found that I never needed to readjust the fitment of the headphones, once in place they stayed there comfortably for the whole duration, even when having to raise from my seat to power up some steep country hills!