I used it with helmet it worked prefect
I am a 62 year old motorbiker, with a long oval head. It took me years to find the ideal helmet and glasses - I've always been wearing Silhouette titanium eyeware which is extremely light and flexible. However, it is also very flimsy and cannot be inserted in, once the helmet is on me.
So I was delighted to discover this new option which has all the good features of the Silhouette, but is more robust, plus I love the magnetic attachment shades!
Narrow Ninox fits my head perfectly with long enough stems. I recommend!
And yes, the long oval helmet that also fits perfectly is the Shoei Neotec 2.
I love them already! The pair is light, and so comfortable when wearing a helmet.
Love these glasses - fit under my headset and in my helmet. The solution I had been looking for.