December, 2016: The Giro Atmos is DiscontinuedThe Atmos sits near the top of the Giro's road cycling line, just below the flagship Aeon. Giro touts the Atmos as the ventilation king in their helmet line. We agree that the Atmos is one of the best-ventilated helmets we've ever worn, but our testers couldn't perceive a difference between the Giro Aeon and the Atmos in our user test. The Atmos is a noticeable 1.45 ounces (41 grams) heavier than the Aeon in size medium. The Atmos is also less durable than the already fragile Aeon.
Like all of the Giro helmets in our test, the Atmos is available in three sizes. We found that it fit similarly to the Aeon, Savant, and Giro Xar, which all use the same RocLoc5 retention system as the Atmos. The Giro Air Attack fits a bit smaller than the Atmos due to its slightly different retention system.
The Atmos comes in at least nine different colors to help you match your kit. The Atmos has been a part of the Giro line for some time now, and has been produced in a number of discontinued colors that may still be available around the net.