I've owned the Sony MDR-G57 Headphones for a few years now and have worn through two pairs of them. The simple design, which wraps around the back of the neck, is great for anyone that wears caps or helmets or anything on their head that usually gets in the way of normal headphone bands.
These are inexpensive headphones but the quality isn't too great. I've had problems with the foam padding tearing and eventually falling off the headphones. The sound quality is also nothing special, but for $15-$20 it's hard to complain.
I used to love using these headphones for long bicycle rides but I've recently been converted to earbud style headphones, which are better for sports and other active movements because they don't allow wind to pass between the headphone and the ear, which creates a very loud disturbance.
I'd recommend these headphones to anyone looking for a cheap pair that will last for a while. Don't expect anything too special though.