A helmet is the single most effective means of preventing and reducing the severity of head injuries. According to multiple studies, you can reduce head injuries from anywhere between 45-85% by wearing a helmet. With that in mind, you should always wear a helmet when riding your bike.

Overview of CPSC Safety Standards

Helmet standards help to govern the design and integrity of helmets so that riders get products that are safe and well designed for the type of riding they enjoy. When it comes to standards for cycling helmets sold in the U.S., there are three things to know

  • All cycling helmets sold in the U.S. must meet the government's CPSC (Consumer Products Safety Commission) standard.
  • The CPSC standards came with input from several sources and based on the most recent analysis of usage and injury data for cycling.
  • There are two versions of the CPSC standard– one for Adult and Youth helmets, and one for Infant helmets (children one-year-old and under).The difference between the two standards is the amount of coverage in the rear of the helmet. You can determine which standard a helmet meets by looking at the box label and inside the helmet.

How To Get A Great Fit

A helmet must fit right and be worn properly in order to be effective. Please refer to the fitting steps and common helmet sizes below.

  • The helmet should sit level on your head and cover the top of your forehead.
  • The side straps should form a "V" right under your ears.
  • The buckle should be centered snugly under your chin.
  • When you yawn, do the straps pull down on your helmet? If not, something is off.

Adult Sizes

Adult sizes fits around 98% of the human population.

  • Large (L) - 59-63 cm (23.2-24.8 in)
  • Medium (M) - 55-59 cm (21.7-23.2 in)
  • Small (S) - 51-55 cm (20.1-21.7 in)

Adult Universal Fit Sizes

Adult universal fit sizes fits more than 90% of the human population.

  • Universal (U) - 54-61cm (21.3-24 in)
  • Univeral Women (UW) - 50-57cm (19.7-22.4 in)

Youth Sizes

Youth sizes refers to helmets for children one year or older.

  • Universal Youth (UY)- 50-57cm (19.7-22.4 in)
  • Universal Child (UC) - 50-55 cm (19.7-21.7in)


Infant helmets are designed for infants between 0 to 12 months.

  • One Standard Size - 47-52cm (18.5-20.5 in)

What About Fit for Women?

Contrary to popular belief, there is no significant difference in skull shapes, location of skull features, or the scale of ears, eyes, and nose between men and women. However, there are many different sizes, styles, and colors so that every rider is sure to get a helmet that fits and looks and feels like it was made just for them.