A running headband is a very useful accessory, whether simply going out for a jog or running in a race. It helps to keep the hair out of the face, and some help to keep sweat out of the eyes, both of which are important for comfort and safety. When choosing a running headband, it is important to select one that will stay put; many are designed with slip-resistant strips or even little teeth that grip onto the hair and prevent it from sliding out while running. If it will function as a sweatband as well, be sure it is designed to be absorbent and used for that purpose.
The most important thing for a running headband to do is to stay in place and keep the hair from falling forward into the face. It may be helpful to read reviews online from other people who have used running headbands to find preferred brands or styles. Going to a sporting goods store and actually getting a feel for the running headband as well might be helpful, since you will be able to tell if it feels like it will grip on the hair. Many of them have a rubber strip on the inside to keep them from sliding, or teeth like those on a comb.
Another important factor when selecting a running headband is adjustability. The ability to adjust the headband to make it tighter or looser is an important factor for comfort and use. One size fits all headbands may not work particularly well for running or other vigorous activities. For runners who are concerned about fashion as well, many running gear manufacturers make headbands in a number of different colors and designs. This can make it a bit easier to go from a workout to a different outfit, at least in the interim.
Some running headbands are designed to keep sweat out of the eyes as well. These are typically made of thicker material and worn lower on the head to keep sweat and sunscreen from dripping into the eyes during longer runs. Be sure to choose a running headband designed for this purpose; again, reading reviews online can be a great way to separate contenders and find the best choice. Some are very utilitarian and are also designed to hold headphones as well, to keep them from becoming tangled in the headband and the hair while running.