As late as the mid-1980s, individuals who wore helmets while riding their bicycles were often looked at as being a bit off the beaten path and strangely overprotective of their own health. That viewpoint has changed dramatically because most people know that going on a bicycle trip of any length without a helmet is risky behavior. The key to getting the benefit from the helmet is wearing it correctly. The Bicycle Safety Helmet Institute determined that the average bicyclist has one crash every 4,500 miles and that underscores the need for a helmet.
It's one thing to put on a helmet and it's another thing to wear it correctly. The helmet should cover at least half of the forehead, fit snugly and be attached under the chin. The bicycle helmet should not move more than one inch in any direction.The sizing pads that come with the helmet should be applied for critical protection around the entire head.
Make sure the straps hang down around the side of the head and nowhere near the front of the face. If the straps are in front, they can interfere with your vision. Even if you just notice them in one corner, they are obscuring your peripheral vision. Make sure you buy a helmet that does not have extra long straps so it can fit snugly and nothing obscures your vision.
Wear It Flat
Make sure the helmet is flat on top of your head and not at an angle. Many bicyclists might think they can see better or think it's cooler to tilt the helmet back at an angle. That can be a critical mistake. Many crashes come quickly and the fall can be harsh and straight down. In that case the helmet needs to be flat on your head to protect your forehead and face.
Source: eHow-by Steve Silverman/ photo from kval.com