When working with endangered desert tortoises, it's important to ensure that the animal is not startled in any way. If they feel threatened, they could potentially void their bladder, and considering that the bladder makes up 40% of their body weight, this would be a massive waste of water resources that a desert dwelling reptile simply can't afford to lose. If one's sunglasses were to slip off and hit the tortoise, there's a chance that it could become startled and release all the water in its bladder.
These sunnies are perfectly designed to not only help mitigate the risk of scaring a tortoise, but to also keep a biologist's hands free to perform health assessments desert tortoises or to relocate rattlesnakes to a safer location (which you shouldn't do unless you're a trained professional).
That's what my wife called me when I put these on. And it's definitely a vibe. Besides the "post-apocalyptic running person" aesthetic, Ombraz sunglasses have the fantastic function of being super comfortable. It's hard to explain, but it's almost like wearing something completely different from sunglasses - something better. I would definitely recommend these for the outdoors athlete in your life!