I actually bought it for road biking. I'm a long time mountain biker, first time road biker. I find that I love it for both purposes.

The visors on MTB helmets are generally useless when it comes to blocking the sun. This visor has actually been a major help riding at sunset.

The fabric in the back is a touch on the bulky side where the elastic is sewn in, so I just make sure I line it up below the back of my helmet, and it's all good.

As far as temps go, I haven't used it in mid-summer desert heat, but for late summer, and a cool fall, it has been perfect so far.