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Giro
Aeon Helmet

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Cooling comfort.

In the never-ending quest for helmet lightness, one fact makes us rest easy: Even the most feathery helmets must pass the CPSC safety standard for impact resistance. If, for example, you've ever picked up a Giro Prolight, you know why this is a concern. It seems impossible that a near-weightless thing like the Prolight offers adequate protection. Amazingly, though, it passes the CPSC testing just fine.


The Prolight tips the scale at 200 g, nearly 50% lighter than most alternatives in its $200 price range. Its lightness comes thanks to several factors, the most noticeable of which is its lack of fit adjustment hardware. Its Roc Loc SL is made from elastic and offers none of the fine-tuning of other Roc Loc models. Furthermore, the strap buckles beneath your ears are fixed and non-adjustable on the Prolight. And while this might seem like a reasonable price to pay for lightness, if you ever choose to wear a cycling cap or winter hat beneath your helmet, the resulting tightness around your head is a bummer.


Enter the Giro Aeon. With the Aeon, Giro's goal is to offer the next generation of superlight helmet design. The Aeon marries the breathtaking lightness of the Prolight and the fabulous ventilation and adjustability of the Ionos.


At 218 g (size Medium), the Aeon is in the same weight class as the Prolight, but it offers far more fine-tunability to the fit. It comes with Giro's all-new Roc Loc 5 retention system. For starters, the indexed Micro Dial lets you adjust the tension with a two fingered twist. And itsGiro Aeon Helmet  Detail three position bracket allows 15mm of vertical adjustment in the retention basket -- enough to fit any head shape comfortably. In another improvement over the Prolight, you get clever strap management. The retention basket has strap holders to ensure that they'll be right where you want them by the time the helmet falls into place on your head.


The Aeon uses in-mold construction to fuse the foam liner to the abrasion and puncture resistant polycarbonate shell as other Giro helmets. However, Giro uses a low-density EPS liner for the Aeon that performs the same important task of absorbing impacts, yet it's 15% lighter than the foam they used previously. Giro took advantage of that weight savings by foregoing the composite reinforcement found on the Ionos. Instead, a thermoformed SL Roll Cage reinforces the Aeon for maximum safety, yet it's 49% lighter than the Ionos' composite sub frame.


The Giro Aeon has 24 massive Wind Tunnel vents to suck cool air in the front and flush warm air out the back, even at relatively slow speeds. The Giro Aeon is available in Small, Medium, and Large and comes in five color combinations -- Black/Charcoal, Blue/Black, Highlight Yellow/Black, Matte Titanium/Silver, Red/Black, and White/Silver.


  • Thermo-formed SL Roll Cage reinforcement provides structural integrity without adding excess weight or hindering airflow
  • Roc Loc 5 fit system is easy to adjust and anatomically cradles the head for long-term comfort
  • 24 Wind Tunnel vents and internal channeling direct cooling air through the helmet
  • X-static padding wicks moisture from the head, and is washable to prevent foul odors




Certifications
Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older
Fit Adjustment
Roc Loc 5
Manufacturer Warranty
1 year
Claimed Weight
222 g