The Helios is very slightly lighter than more expensive the Aether – 260g v 269g in medium – and according to Giro it also tested faster in the wind tunnel. The idea of MIPS, whether Spherical or in its original format, is to add protection against rotational forces transferred to the brain in an angled impact. So far, all three helmets with this system (the Aether plus the Giro Tyrant and Giro Manifest mtb helmets) have received a five-star rating from independent safety testers Virginia Tech. In this case, one is black and the other is green, and they can move independently of each other with 10-15mm of travel thanks to a low-friction layer sandwiched between them and secured with elastomer anchors. With Spherical, the sliding MIPS layer is integrated into the helmet itself: it’s basically an EPS shell within an EPS shell. Spherical tech does away with the clear (or sometimes yellow) plastic MIPS liner of the original helmets that sat directly against the head and got a bit sweaty, sometimes also pulling your hair. ‘Spherical’ refers to Giro’s exclusive MIPS-powered technology that it developed with the Swedish company in its own lab. I’m giving the Helios another perfect score because in practical terms it does everything the Aether can do and even improves on it in some areas it has a broader appeal, and it’s priced lower than the Aether. > Best road cycling helmets: buyer’s guide The Helios has a lower price and an expanded remit: whereas the Aether was designed and styled purely for the road, the Helios is for “road cyclists, gravel enthusiasts and adventure riders.” The Giro Helios Spherical is the US brand’s second road helmet to use Spherical MIPS protection, the first being the £269.99 Aether which we awarded a perfect score and which made our Editor’s Choice line-up in 2020.
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