These are a `one size fits all' headphones, which is great if you fit within its size range then you will probably be gushing for joy like the majority of reviewers here. On the other hand, if you fall outside of the size range, like me, then you are going to be in for a painful frustrating experience with this product. The earpieces are made of hard plastic with no cushioning and the neckband is designed to exert pressure on them to keep them in place during sporting activities. Unfortunately there is no means of making adjustments to make them fit comfortably. So if they are not a good fit then they will feel like someone is constantly trying to force hard plastic clothes pegs into your ear holes. Another problem with the design is that the neckband protrudes too far behind the head. This won't be a problem if you are only going to use them for jogging or cycling but if you want to use them in the gym as well, like me, then you are in for another painful experience. Whenever the back of my head came into contact with any surfaces such as benches, headrests or the floor then the neckband would be driven forward causing the earpieces to stab painfully into my ears.
I really tried to make these headphones work as I needed a set that would stay in place during a workout. But after many attempts I had to give them up, they were just too excruciating to use.
If it is at all possible I would advise potential buyers to find a shop, or a friend who has them, who will allow them to try them first before buying, if I had done so I would have known within minutes they were no good for me. On the plus side the sound quality is very good especially if you are an ipod owner.