+ Integrated basic TuneUps. Hooks you up to your personal music player.
+ Removable earpads for extra warmth when you want it.
+ Goggle notch to keep goggles in place, even during a fall
+ High-impact ABS shell
+ EPS liner. The most highly impact absorbant and lightweight liner out there.
+ Super Fit™ designed to fit 98% of people perfectly.

TuneUps™
Our basic TuneUps audio system offers great stereo sound with an in-line mute button and a new volume dial for quick, simple sound control when you need it. The system installs in a snap without tools and without compromising the fit or feel of our helmets. Snap it in to your own music player, press play and drop in to your run with your own personal soundtrack.
Available as integrated equipment in the following Giro helmets: G9, Encore 2, and Bad Lieutenant.
Upgrade kits available for the following Giro helmets: Omen, Fuse, G10 MX, G10, G9, Nine.9, Bad Lieutenant and Encore 2

SIZES	HEAD CIRCUMFERENCE (measure above the ears and right above your eyebrows)
Child	19.25 - 21.25 in 49 - 54 cm
Youth XS/S	20.5 - 21.75 in 52 - 55.5 cm
Youth M/L	22 - 23.75 in 55.5 - 59 cm
Adult XS	20.5 - 21 in 52 - 53.5 cm
Adult S	21 - 21.75 in 53.5 - 55.5 cm
Adult M	21.75 - 22.5 in 55.5 - 57 cm
Adult L	22.5 - 23 in 57 - 59 cm
Adult XL	23 - 23.75 in 59 - 60.5 cm
Adult XXL	23.75 - 24.5 in 60.5 - 62.5 cm