Size Charts
Safety information
Engaging in cycling, skating, snow sports or similar without a helmet is a major cause of brain injury in Australia. The Westmead Childrens Hospital states that the most common causes of brain injury in Australia are:• Motor vehicle and bike accidents
• Falls
• Sporting injuries
A brain injury can mean anything from a skull fracture to bruising of the brain, trauma, paralysis, coma or death. Helmet wearing is the law. Be firm in your own family and among friends about wearing helmets and enjoying outdoor sports safely. Make it fun to wear a helmet.
Children should not ride in bike seats or trailers until they can support themselves and the weight of a helmet. Teach your children about bike, board, water and helmet safety as soon as possible.
Why it’s important for your helmet to fit
Proper helmet fit is an important factor for both safety and comfort. Helmets which are too big, slip backwards or have ill-adjusted straps can do more harm than good. Helmets too small or tight are plain uncomfortable. In Australia, bicycle helmets are the law. In Victoria laws have recently been updated to include helmet-use for skating and foot scooters. Snow and water activities are generally adventure-packed and increased use of helmets for these activities is also becoming common to prevent serious brain injury.
Don't hamper or compromise the fit and function of your helmet by forgetting to do up straps, or by wearing extra items underneath (beanies, caps, hats). Responsibility for the risks associated with your personal style are your own.
Follow these instructions and use the size chart below as a guideline.

Nutcase Little Nutty Size Chart

Nutcase Street Size Chart (2010 Sizing)

NOTE: Limited helmets are available for larger circumferences: L-XL (61-64cm) Please see specific product page for options shown.
Nutcase Water Size Chart

Nutcase Snow Size Chart

Nutcase Snow Size Chart (Rip Shell)


