1.Find a helmet strap system that's comfortable and easy to get in and out of. Also make sure that it matches your riding style — beefy for rough terrain and mountain trails, lighter and cooler for road racing. Try a couple of different systems before you decide on one.

2.Whatever your size, simple adjustments can customize the fit. Nearly all helmets offer an internal universal-fit sizing ring (one size fits all) and adjustable straps. Occasionally some helmets, including some kids' helmets, still offer a selection of fit pads to accomplish this task.

3.To adjust the fit, first expand the sizing ring before you place a helmet on your head. Once the helmet is in place, reach behind your head and tighten the ring (by pushing a slider or twisting a dial) until you  achieve a snug fit .