I've been looking for a while for some sunnies to wear while mountain biking. I felt the goggles I was wearing made me look too try hard, I'm not that hardcore! I haven't had much success in the past with sunnies though so my expectations were pretty low but I have been pleasantly surprised by how well these perform. They have only fogged up a little on a uphill once and they sit well without bouncing around. I haven't tried them with my full face helmet yet due to lockdown.