I'm a contact wearing convertible driver with a big head...that's a challenging combination when it comes to finding good sunglasses. I've been driving a convertible for nearly 25 years so I've been through a lot of sunglasses and I've had a lot of disappointments. I need something that does a good job cutting glare and that wraps around my head enough to control the wind so that my contacts don't dry out. These do both and they also look good while they are doing it. I have several pairs of sunglasses but these are fast becoming my "go to" glasses, especially for long trips. I'm not going to intentionally test the "unbreakable" claim that these make but, based on experience, I'm sure there will be a point where I will find out just how "unbreakable" these actually are. If they DON'T manage to withstand me sitting on them...or whatever accidental torture test takes place...I do believe that I will be buying another pair.