The S-One Lifer Helmet is the best fitting, high-impact and multi-impact Australian-certified helmet on the market.

We recommend checking the sizing below / off S-One's top notch sizing chart, then selecting the sizing kits above and below the helmet you're ordereing.

Check out the liners here: S-One Helmet Liner Kits

Sizing: S: 53.5cm (21")
M: 54.5cm (21.5")
L: 56cm (22")
XL: 57.5cm(22.5")
XXL: 58.5cm (23")
XXXL: 59.5cm (23.5")

How to measure:
Use a soft tape measure to measure the circumference (around) of your head and an inch (2.54cm) above your eyebrows. Keep the tape level front to back. If you don't have a measuring tape, use a piece of string or shoelace, then lay it out on a table and measure it with a ruler.

• Multiple and high-impact EPS Fusion foam
• Deep Design
• Sweat absorbing liner
• Lightweight construction
• High impact ABS outer shell