"This mirror is the product of much frustration- I spent years breaking other designs and wondering what was going on behind me on the road. Eventually, when I dropped my bike and found myself buying two(!) new master cylinders as a result, I decided it was time to make a really good mirror, one that would function well as a mirror, and also protect the bike (and me) from damage."
That it work as well as an OEM mirror for seeing what was going on behind.
That it would be indestructible. It would have to give way in a crash to avoid damage not only to the mirror, but also to the bike.
That it could fold completely out of the way, so that when I am offroad, I don't have to think about it.
Many experiments later, the mirrors for sale here is the result. Both models hit all three marks right on the nose. We use SAE spec glass to give maximum visibility (it can be important to distinguish Crown Victoria headlights from other vehicles!), it is made right here in Colorado from a super tough nylon that we are so certain will survive we offer a lifetime warranty (on the housing, not the glass, but you can buy the glass seperately), and sure enough, it folds right down when you want it gone.
If you're deciding between the Adventure model, and the Enduro, our advice is simple. If you plan to fold the mirror down a large percentage of the time, the Enduro is right for you. The long size means the head of the mirror tucks away right behind the headlight. If the mirror will more or less remain extended, get the Adventure- the more compact design is more stable at highway speeds. Either way, you can't go wrong.