At 264g for my medium sample, the Aries is five percent lighter than the Aether it replaces and 2g lighter than the Giro Eclipse Spherical MIPS aero road helmet. While you get a lot in terms of features, what you don’t get is a lot of helmet – but I mean that in a good way. Lots of visible skull means lots of cooling power (Image credit: GuyKesTV) Performance There are rubber grip tabs for the arms of your glasses if you take them off and slide them into the front of the Aries. The lower rim on the inner helmet has cuts outs to pull air up from inside your glasses lenses. The Aries is also the first Giro helmet to use a central forehead vent formed by joining the two central bars early and stopping them short of the lower rim. There are also four exhaust vents and two flank vents on either side with transverse internal channels helping cross flow at lower speeds. which is basically a series of five fully open channels from front to rear. That lets Giro create what they call a 24-vent structure. The outer/upper shell is also reinforced with an evolved version of the Aura strengthening arch with a single front bar and central twin bar. These are tethered together with stretchy MIPS tabs so they can rotate like a ball and socket, dissipating impact energy in the process. That uses two separate hard shell encased, progressive density nano-bead EPS foam shells stacked on top of each other. The Aries is a direct development of Giro’s Aether and shares the same ‘ Spherical MIPS’ design. Giro's unique 'Spherical MIPS' construction uses separate, stretch tethered lower/inner and upper/outer segments that slide over each other to reduce impact trauma (Image credit: GuyKesTV) Design and build
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