Got a lot of brains? The S-One Mega Lifer Helmet is the best fitting, high-impact and multi-impact Australian-certified helmet on the market made just for your head!

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:
XS: 57.1cm (22.5")
S: 58.5cm (23")
M: 59.5cm (23.5")
L: 61cm (24")
XL: 62.2cm (24.5")
XXL: 63.5cm (25")
XXXL: 64.7cm (25.5")

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.

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