If one adjustable vent is good, then two must be better. If that's true, then the Omen is the better helmet because it offers a DUAL VENTING SYSTEM that offers adjustable vents in the front and in the rear of the helmet. This gives you ultimate comfort control.
The Giro Omen helmet features.....
Weight: only 17.5 ounces in a size LG.
Chin strap: Adjustable and padded with snap clip.
Construction: In-mold Hardbody with high-impact PC/ABS zones for extra protection.
Liner: EPS liner with removable ear pads for springtime sessions or switching out for music.
Fit system: Giro's unique In Form™ adjustable fit system allows a wide range of fit per size. You are able to dial in your comfort level with the adjustable headband. This comes in especially handy when you need a little extra room when wearing a head liner or if you have an odd shaped head.
DUAL ADJUSTABLE VENTING: You get 14 wind tunnel vents with a DUAL thermostat control. This means the vents in the front can be adjusted separate from the vents in the rear. Both vents can be adjusted with your gloves and independently of each other to keep you comfortable.
Goggle notch is built into the shell to keep the strap in place along with a durable, easy to use rear goggle clip.
Conforms to all ASTM F2040 and CE EN1077 approved standards.
Sizing your Giro G10 helmet. Giro's unique In Form™ adjustable fit system allows a wide range of fit per each size. You are able to dial in your comfort level with a built in adjustable headband. This comes in especially handy when you need a little extra room when wearing a head liner. To get the correct helmet size, measure the circumference of your head just above the eyebrows with a soft tape measure. When in doubt, go up one size.
SMALL, between 52 - 55.5 cm or 20.5 - 21.75 inches
MEDIUM, between 55.5 - 59 cm or 21.75 - 23 inches
LARGE, between 59 - 62.5 cm or 23 - 24.25 inches
Our comments: Dual adjustable vents make this helmet stand out from the rest. It makes it easy to adjust to your comfort level and the vents were easy to use, even with gloves on! But the Giro Omen fit is by far, one of the most comfortable.
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