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Giro Aries Spherical MIPS Bike Helmet

Giro Aries Spherical MIPS Bike Helmet
  • Color: Matte Ano Blue
  • Color: Matte Ano Blue
  • Color: Matte Ano Blue
  • Color: Matte Ano Blue
  • Color: Matte Black
  • Color: Matte Black
  • Color: Matte Black
  • Color: Matte Black
  • Color: Matte Carbon / Red
  • Color: Matte Carbon / Red
  • Color: Matte Carbon / Red
  • Color: Matte Carbon / Red
Color: Matte Black
Size: Select size
Please select options Unavailable


Lighter, cooler, sleeker, plus all the added protection of Spherical Technology powered by Mips® and our new DryCore™ sweat management system: the Aries Spherical is like nothing before.

A helmet that feels like it isn't there: the all-new Aries™ Spherical is like nothing before. Its sleeker form and lighter weight (only 270 grams in size medium, CE certification), deliver sensational comfort and cooling power.

Spherical Technology™, our ball-and-socket design powered by Mips®, adds protection by redirecting energy away from the brain in certain impacts, and Progressive Layering with dual densities of Nanobead EPS foam adds more comprehensive energy management.

24 Wind Tunnel vents are maximized by the AURA II Reinforcement Arch, while a plush DryCore™ brow pad manages sweat and combines with a network of intricately engineered deep internal channeling to elevate comfort.

From the proven reliability and adjustability of the Roc Loc® 5+ Air fit system, to full lower hardbody coverage to enhance durability, to the meticulous production quality, the Aries is state-of-the-art performance, protection, and style.

24 Wind Tunnell Vents

Giro helmets are engineered with our proprietary Wind Tunnel venting system. This elaborate design combines active vents in the helmet’s shell with exhaust channels inside the helmet that thrust cool, fresh air over and around the rider’s head while forcing heat and stale air out.

Spherical Technology

This unique ball-and-socket design, powered by Mips®, helps redirect impact forces. Spherical Technology also boasts more comfort, improved airflow, and Progressive Layering (which mates two densities of EPS foam to address a wide range of impact energy).


The DryCore™ sweat management system utilizes an internal silicone bead to redirect moisture away from the rider's brow and eliminate the irritation of sweat dripping into the eyes.


IONIC+ ® Padding

Pure Silver is the secret ingredient that gives IONIC+ ® the power to provide natural, permanent odor protection to keep your helmet feeling fresh.

Eyewear Docking Ports

Integrated eyewear docking ports with rubber grippers help to secure sunglasses.

Wrap a measuring tape around your head, keeping the tape level from front to back. Note the measurement.

Adult Super Fit SizeCircumference
Small 51 - 55 cm
Medium 55 - 59 cm
Large 59 - 63 cm

Note: Make sure the helmet fits with a little room when the fit system is loose, and sits low enough to protect your forehead without hindering your vision. Once you’ve got the right size, you can adjust the fit.

How To Adjust The Fit

  1. If the helmet has one, adjust the fit system at the rear of the helmet for a snug, secure fit. Some fit systems also include a vertical tuning feature that allows you to adjust the fore/aft tilt, for optimal positioning on your head.
  2. Adjust the straps so that they sit just below the earlobes.
  3. Adjust the buckle so that it rests against the back of the jaw/throat.
  4. Adjust the interior pads if needed.
  5. Check the fit to make sure helmet is comfortable and secure. It should not roll forward or back, or be able to slide off.

Researchers at independent testing facility Virginia Tech gave Aries Spherical their best score event in their rankings of which helmets best reduce the risk of injury. All Giro helmets with Spherical Technology have received their top level of 5 stars.


Weight (g) 275g (size Medium CPSC)
Retention System Roc Loc 5
Protection MIPS (Multi-Directional Impact Protection System) | Spherical Technology
Certification Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older
Type Road Racing

* Subject to change without notice.


The Giro Aries Spherical Cycling Helmet

Part Numbers

Option UPC Store SKU
Matte Black / Medium 196178248167 HEL519155503
Matte Black / Large 196178248174 HEL478902266
Matte Carbon / Red / Large 196178248204 HEL555451204