Size chart

Mate	Oval head	Round head
Medium	54 - 58 cm	54 - 57 cm
Large	58 - 62 cm	57 - 62 cm

Helmet size is determined by the circumference of your head. Measure this by placing a flexible measuring tape or cord around your head: just above your eyebrows and along the widest point at the back. Make sure the tape remains straight and runs all the way around, from front to back.

There are two common head shapes that affect the ERT helmet fit:

The ERT helmet is designed to provide optimal support for both head shapes and, thanks to its adjustable fit, remains secure and comfortable — even on longer rides.