Our Response to the Coronavirus
This carousel displays a list of buttons that updates the main product image when a button is clicked
  • Options
  • Detail Images

GiroAether MIPS Helmet

Sale $259.99 - $349.95

Item # GIR00JZ

Select options
  • Cancel
  • Select options
  • Matte White/Silver, S ($349.95)
  • Matte Black/Electric Purple, L ($349.95)
  • Matte Black/Electric Purple, M ($349.95)
  • Matte Black/Electric Purple, S ($349.95)
  • Matte Midnight Bars, L ($349.95)
  • Matte Midnight Bars, M ($349.95)
  • Matte Midnight Bars, S ($349.95)
  • Matte True Spruce/Black Fade, L ($349.95)
  • Matte True Spruce/Black Fade, M ($349.95)
  • Matte True Spruce/Black Fade, S ($349.95)
  • Matte White/Silver, M ($349.95)
  • Matte White/Silver, L ($349.95)
  • Matte Black, M ($349.95)
  • Matte Black, L ($349.95)
  • Olive/Citron, S ($324.95)
  • Matte Bright Red/Dark Red, S ($349.95)
  • Highlight Yellow/Black, S ($349.95)
  • Highlight Yellow/Black, L ($349.95)
  • Matte Citron/White, S ($259.99)
  • Matte Citron/White, M ($259.99)
  • Matte Citron/White, L ($259.99)
  • Matte Blue, S ($349.95)
  • Matte Blue, L ($349.95)
  • 100% Guaranteed Returns
  • Free Shipping on orders over $50

Item # GIR00JZ

Aether MIPS Helmet

When Giro set its aim at designing the groundbreaking Aether MIPS Helmet, it's goal was to create the safest road helmet it could, without making any sacrifices to weight, comfort, aerodynamics, or ventilation. In typical Giro fashion, it exceeded expectations at every objective and the Aether provides the discerning cyclist a stylish lid with absolutely zero compromises. You'll certainly notice them atop the Team BMC pros at this year's Tour, providing them with the protection they need during the chaotic sprint finishes that define the start of the 3-week race, and while plummeting down high-speed descents on exposed, narrow, hairpin roads, all the while keeping them from overheating while the sun bakes down on the French countryside. 

The most revolutionary feature on the Aether is the all-new MIPS Spherical protection system. By now, we're all pretty familiar with how standard MIPS works, using a plastic liner inside the helmet to act as a slip-plane, helping to redirect the impact energy at certain angles. With MIPS Spherical, the principles are the same, however, instead of that slip plane sitting against your head, often compromising the fit and choking off much-needed ventilation, two layers of foam on the outside of the helmet slide against one another becoming the essential components allowing for the MIPS mechanics.

The progressive layering of the multi-density EPS foam allows Giro to save weight with the impact absorbing material and its covered by a 6-piece polycarbonate shell. Its laser cut with surgical-like precision that's required for MIPS Spherical to properly work, and even the logo permanently molded as part of the shell, no cheap sticker afterthoughts. The shell has 11 vents, which on paper doesn't sound like much, but they are huge and conspire with the deep channeling inside, again afforded by moving the MIPS Spherical on the outside, to move air over your scalp, keeping you cooler while racing or doing some tempo intensity workouts during the hottest part of the day. With those massive vents, Giro needed to bolster the structural integrity of the shell and does so with the translucent, shatterproof Aura arch which melds seamlessly with the helmets aesthetics. The last shell feature worth noting is the integrated eyewear docking port letting you remove and secure your sunglasses when daylight is fleeting or on particularly stifling climbs.

Among many, one area where Giro is truely class leading is in its fit retention system and The Aether gets its latest with the Roc Loc 5 Plus. We love its ability to adjust the fit on the fly with precision and just one hand. Wore a hat yesterday but not donning one today? No problem the adjustment is made in less time than it took to read this. Further customization of fit comes courtesy of its ability to adjust the occipital contact points independently.

The Giro Aether MIPS Helmet is available in three sizes ranging from Small to Large in the colors Matte White/Silver, Matte Black/Pearl, Matte Bright Red/Dark Red, Matte Black, Matte Black Flash, Matte Blue, Matte Citron/White, Highlight Yellow/Black, and Olive/Citron.

  • A helmet that's big on safety and small on sacrifices
  • In-Mold construction fuses the laser-cut shell to the EPS foam
  • Roc Loc 5 Plus offers quick, customized adjustments
  • 11 huge vents with deep channeling keep you cooler
  • Sunglass ports hold shades on climbs and periods on low-light
  • MIPS Spherical moves the slip-plane externally
  • Helps to redirect the energy of certain impact forces
  • Giro once again revolutionizes what we know as the cycling helmet
Tech SpecsSize
Tech Specs
Shell Material
in-mold polycarbonate
Impact Foam
Multiple Impact
MIPS Spherical
11 vents
Fit Adjustment
Roc Loc 5 Plus
Recommended Use
road cycling
Manufacturer Warranty
1 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.

Reviews & Community


Write a review

    Add a:
  • Photos
  • Videos

No file chosen

Rather attach a photo from your computer?


Product Fit:

Runs smallTrue to sizeRuns large

Add Your Size


Height (ft, in):

Weight (lbs):

Size Purchased:

Only jpg, jpeg, png, gif or bmp files please.

Submit ReviewCancel
Unanswered Question

What exactly is the Black Flash color way? Is it somehow reflective? If so, photos of it in action would be great!


  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: Medium

I guess I have a weird shaped head and I know it's right between M and L in most helmets. I'd been looking for about a year and even ordered a couple of helmets here at CS...but, alas, they went back. I ended up doing the brick and mortar route with the only requirement being that it FIT, I didn't care who or how much. Well, of course, the Giro Aether fit perfect on my malformed noggin. Didn't know how much it cost until I was at checkout. No complaints, fits, breathes and even manages to be more comfortable with my head up vs. lowered, which is a bonus.

GIRO Aether Helmet

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Large

Been riding with Giro helmets for years and always happy. My Atmos was favorite helmet ever. When it was time to upgrade the Aether was really all that seemed to make sense from Giro so selected based on past history. I ride about 500 miles per month, mostly road in very hilly area. My specific complaint is that the helmet is weighted to the front which causes it to slip forward and down unless it is tightened to the point of discomfort. I have tried adjusting and wearing different weight sweat bands and ear warmers and hats and the situation is the same across all. I will keep as a back-up but now in the market for a new "primary" helmet. I have had the helmet for about 6 months so plenty long to have a good idea of comfort and options.

I've been cycling with the Giro Synthe for years (average about 6,000 mi/yr), and have not had the problem described above. It's a very good helmet, light, fits and wears well. Is SI B reviewing the Giro helmet?

I've been using the Giro Synthe and have not had the problems described above with the Aether.

Pretty cool!

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Medium

Alright Giro, you've got me! I previously have really hated MIPS, it's hot, hair pulling, and makes your helmet look like it's a size too large for your head (which it sort of is to make room for the soda bottle thing). But this design is really excellent. It's similar to my 6D trail helmet in function but looks really nice and without the hair pulling. Best Giro helmet yet I'd say.

Giro AetherMIPS Helmet

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Medium

I wanted the matte black/pearl helmet but they were unavailable for months. Ian my Competitive Cyclist "gear head" was able to help me get one. I'm very satisfied with the helmet. I feel better protected. I've used the helmet more that 10 times, and am very pleased with it.

Giro are the best

  • Familiarity: I've used it several times

I had a couple of the Giro Synthe MIPS. I crashed and broke one a few weeks ago. Originally tried another brand that has some new technology. The helmet was unbelievably uncomfortable. Bought this helmet and I am very happy with it. The Synthe MIPS is slightly more comfortable but this one is still great. I've done several 3-4 hour rides with it and have no complaints.

How does it fit compared to the Synthe? any shape differences internally?

Well, I put it to the test

  • Fit: True to size

I just recently decided to update to Mips technology after happily using the Giro Synthe for the last few years. The cost of the Aether was a bit of a deterrent so I first tried the Bell Z20 Mips in Ghost (reflective silver). I found/confirmed that Bell is more suitable for round heads...where Giro favors my large, oblong head. I ponied up and exchanged for the Aether in matte black/ flash (reflective). I should say that the Bell was impressive, and comfortable... particularly the padding design. Also kudos for including a second set of pads with Z20 (take note Giro!). The reflective qualities of the "Ghost Z20" were far inferior to the "Flash" of the Giro.

So the fit and finish of the Aether impresses, as do the reflective qualities of the Flash. It is a bit less bulky then the Z20. The fit and comfort (to my primarily bald head) is similar to the Synthe. I took a good deal of time getting the straps set up just right for me. Ventilation is comparable or a bit better then the Synthe. Due to the slightly increased depth of the vents (due to Mips design), crosswinds don't seem penetrate into the helmet as well.

Unique to this review, I fortunately/unfortunately can attest to the safety of the helmet (what we spend the money for, but hope not to use). On my fourth ride in the helmet, at the back of a 3 man pace line, I caught a bad rut/potlhole on a cruddy stretch of pavement that dropped me onto my bars. I almost recovered but went into rider #2's back tire, and I went down very hard at 20+mph. In my particular circumstance the Mips did an amazing job of buffering a violent impact. I never lost consciousness or was concussed (did sustain road rash, torn Assos bibs, and 3 breaks in my clavicle requiring surgical repair). The attached photo shows the result.

So the Aether is obviously spendy. Is it worth it? In my case...Absolutely (although I wish I had been left to wonder).

Well, I put it to the test

Wow photo says it all. Hope your recovery is quick.

Really Nice Helmet

    Fits great, nice and light as well. I like the way it looks and it is vented very nicely.

    Great Update

    • Fit: True to size
    • Size Bought: medium

    I've worn the Aether for the past 6 months and had the Giro Synthe before. The Synthe saved my brain in a crash in Lamb's Canyon on my road bike which made me a loyal Giro fan. I replaced my cracked Synthe with the Aether because of it's sleek look and updated MIPS tech. It is my #1 helmet of choice each morning when I ride because of the fit and aero design.

    Great Update

    Will wait for v. 2

      Love the idea of this MIPS. The two parts of the helmet really do move. I wanted to like the helmet but it fits really low on my head, barely clearing my ears and barely leaving room for my sunglasses. I also found the retention band in the front scratched my forehead. It's likely my head as the helmet looks different in pictures. Hopefully the technology will trickle down to less costly helmets and Giro will address some of the fit issues in v. 2.

      protect your noggin!

        Fit: true to size
        Great, comfortable fit and ventilation. Highly recommended for true protection for your noggin.

        Another great Giro helmet

        • Familiarity: I've put it through the wringer
        • Fit: True to size

        I have ridden Giro helmets since their inception. After crashing back in June, I replaced my Atmos II with this helmet (had to wait until August to get it!). Overall it is a great helmet. Fits well, adjusts easily and is really light and airy. I really like it but only hold back one star because of sweat management. I would like to see Giro do a better sweatband - or build in a channel/groove. But I sweat a lot, so maybe that's more my problem.

        I ordered this a few weeks ago...looking forward to getting it. Any idea on when these will ship? It’s said “shipped within 2-3 weeks” for awhile. Thanks!

        Hi Robert! I checked our inventory and those are scheduled to arrive 8/27.

        Nate (natsimpson@competitivecyclist.com)