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Item # GIR00AB

Not afraid of getting dirty.

Giro's lowest profile helmet is now available with more protection than ever for your most thrilling rides. Take the Quarter MIPS Helmet to the trails for affordable protection, without added bulk. The helmet includes an outer shell made of impact-absorbing ABS plastic, and it has the distinction of being the lightest Giro helmet made using ABS. The shell surrounds an inner EPS foam liner with riveted webbing anchors to reinforce its strength, and now includes MIPS for added safety. MIPS, or Multi Directional Impact Protection System, refers to the Swedish technology that can be added to helmets in the form of a thin inner layer that rotates slightly upon impact to absorb the brain-damaging rotational energy created in certain crashes. Less rotation, less likelihood of a head injury.

As an extra, Giro made the decision to add a polyurethane coating around the outside of the EPS liner to give the foam some protection in the areas where it's most likely to be damaged during bumps and scrapes. The included Fit Kit foam pads are removable so you can get a customized fit, and they can even be washed, if you're so inclined. Eight vents keep the Quarter breathable, and rather than use their universal shell size, Giro makes the Quarter in three Super Fit sizes to make sure you're getting the right fit.

Tech Specs

Shell Material:
ABS plastic
Impact Foam:
EPS foam
Multiple Impact:
8 vents
Fit Adjustment:
Fit Kit pad system
Full Face:
Recommended Use:
mountain biking
Manufacturer Warranty:
1 year

Size chart


Adult Cycling Helmets
 SS/MMM/LLXLAdult UniversalWomen's Universal
Head Circumference 20 - 21.75in
(51 - 55cm)
20 - 22.5in
(51 - 57cm)
21.75 - 23.25in
(55 - 59cm)
21.75 - 24in
(55 - 61cm)
23.25 - 24.75in
(59 - 63cm)
24 - 25.55in
(61 - 65cm)
21.25 - 24in
(54 - 61cm)
19.75 - 22.5in
(50 - 57cm)
Head Circumference 20 - 20.75in
(51 - 53cm)
21.25 - 22in
(54 - 56cm)
22.5 - 23.25in
(57 - 59cm)
23.5 - 24.25in
(60 - 62cm)
How to Measure:
For best results, use a tape measure to measure around your head where your hat would fit comfortably.

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