Most Bluetooth sports headphones
have a simple, basic design. They consist of, a single plastic piece that connects the two earpieces behind the back of the head.
But with regard to the way the ear piece is designed, most headphones differ. Keeping the ear bud in the ear, without discomfort, is the key to great design. Most models use a tight fitting piece just above the ear, and then extensions that hold the bud in place inside the ear. There are some downfalls with this particular design. Not all heads are the same size.
That’s why some headphones have a flexible strap much like you would find in a hard hat that adjusts to the wearer’s head. Other manufacturers have made the entire head piece into a flexible adjustable strap. Either option would appeal to anyone that doesn’t have a standard-sized head.
In addition to the fully flexible band, alternatives to the wrap-around-the-head design have already started to pop up in the market. These include ear pieces that are made of hard plastic that wrap or hook completely around your ear. These can be more comfortable than wearing a band around your head.
Other headphones have ear pieces with a small hard plastic piece that sits just over the front of your ear. The rest of the unit is flexible wire that loops around your ear and comes back to go through the hard plastic piece at the bottom of your ear. Basically it makes a loop around your ear and ties off at the bottom. This design seems to be the most secure fit.
Some headphones with this design also come with several different sized ear buds for a better fit, and the unit is water resistant, inside and out.
Another type of Bluetooth sports headphones for iPhone
utilizes a hard plastic three-quarter moon design that wraps around your neck, not your head. The ear buds are then detached from the ends of the unit and go into your ears. They are attached to the neck piece using a wire much like your stereo speakers. The only real down side to this design is that there is nothing holding the buds in your ears, except the bud itself. Therefore this unit would probably not work for most very physical sports.