I have seen this helmet on the pro tour for around a year now and it finally was available this week. Giro is my go to brand for helmets both ski and cycling. I am a size 58 and with all other brands the medium size is too small and the large size is too big. Even some Giro helmets like the Synthe in medium it is too small. Because of that I was stuck with a Giro Cinder Mips for many years. Nice helmet but not ideal and a bit bulky. The traditional Mips was taking a bit place also so when Giro released the Aether with the Spherical Mips i gave it a try last year and the fit was perfect and it sit on the head smoothly. It is perfect on British summer days since the air flows nicely, on the other hand when it is windy or your do a fast ride you tend to feel that it catchs a lot of air. This morning I rode with the eclipse for the first time and the confort is even better than the Aether. It sits on my head perfectly and you can definitely feels the aero with much more less turbulence at speed around 40kmh. you still do get proper air flowing but clearly not as much as the aether. The spherical MIPS is a game changer in both helmets since they allow the helmet to sit on the head much better. To summarize the aether is great and will be used for hilly/mountain ride in spring/summer and the Eclipse is amazing and will be used for faster and winter/spring/fall rides. If I had to chose only one and just use it in England I would go for the Eclipse. The only negative point: they are both expensive but as we say in french, il faut se faire plaisir dans la vie. Finally thank you to the Sigma sport team in Hampton Wick, it is always a pleasure to come to the shop and speak to you.

Good helmet fits well and even got me some PBs so must be Aero !