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GiroRadix MIPS Helmet - Women's


Item # GIRZ31L

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Item # GIRZ31L

Radix MIPS Helmet

Trail-riding sometimes requires a bit more versatility and safety than a classic skateboard helmet can provide, and Giro’s Radix MIPS Helmet delivers the comfort you are looking for when hammering up the cross-country climbs, and the protection you need for the flowy descents. With In-Mold technology, Giro fuses the hardshell to the EPS liner for durability and a lightweight —which comes in under the radar for most riders until having to massage out the sore neck from too heavy a helmet. Trail-specific features are easy to spot as the deep temple and occipital protection is visible with the low reaching brim and rear coverage. And a P.O.V. visor with 15-positions of adjustment sets the Radix apart from traditional road helmets and ensures the sun-spotting between overhead trees and branches won’t disrupt your vision on-trail. MIPS technology is onboard also to added protection during angled impacts and is integrated to the Roc Loc 5 fit system that adjusts on-the-fly with a roll-dial on the back. And a plethora of 25 vents speckles the Radix's landscape to ensure overheating is minimized as much as possible during summer quests deep into the trail network.

  • Trail-riding helmet with enhanced safety and women's specific fit
  • In-Mold construction for durability and lightweight character
  • MIPS technology and deep coverage offer enhance protection from impact
  • Roc Loc 5 fit system for easy adjustments with gloved hands
  • Venting throughout for heat loss on warm and intense trail sessions
  • Adjustable visor blocks the sun nearly all day

Tech Specs
Shell Materialpolycarbonate
Impact FoamEPS
Ventilation25 Wind Tunnel vents
Fit AdjustmentRoc Loc 5 MIPS
VisorP.O.V. visor (15 degrees of adjustment)
Recommended Usecommuting, cross-country, cruising, cyclocross, gravel, trail
Manufacturer Warranty1 year


Adult Cycling Helmets
Super Fit™
Head Circumference

18.5 - 20in

(47 - 51cm)

20 - 21.75in

(51 - 55cm)

21.75 - 23.25in

(55 - 59cm)

23.25 - 24.75in

(59 - 63cm)

24 - 25.55in

(61 - 65cm)

Head Circumference

21.25 - 24in

(54 - 61cm)

19.75 - 22.5in

(50 - 57cm)

22.75 - 25.5in

(58 - 65cm)

How to Measure:
For best results, use a tape measure to measure around your head where your hat would fit comfortably.

What do you think about this product?


>Rating: 5

Good bang for your buck

I've used it once or twice and have initial impressions
True to size
Size Bought

It's amazing to see how far helmet technology has come in recent years. It's great to be able to get MIPS tech in a more budget friendly option helmet. I have ridden Giro helmets for years and so has my wife. We bought this one for her as we have started getting out on more technical trails and needed the back of head protection and more coverage. She likes this helmet a lot. It's lightweight, stylish looking (actually looks small and sleek unlike other chunky looking brands). The adjustability is great and you can get a snug and comfortable fit with the click of one gloved hand while riding. The only downside so far is that the visor doesn't have click adjustment so it is not easy to know what position it is in and seems like it will slip slowly on gnarly descents. Other than that though this helmet seems like a win and I trust Giro to protect our noggins as my wife had a pretty bad road ride crash a few years ago and her Giro helmet cracked in half but her head was protected and no concussion! You can't put a price on safety, especially safety that protects your brain!

>Rating: 5

New Mountain Biker

I've used it several times
True to size
Size Bought
5` 4"

I had my last helmet for 10 years and didn't realize that it wouldn't protect me from concussions and other brain damage. This helmet is adjustable and fits snug without making your head super sweaty. This helmet is also super light and I love the colorway.