For me, I measured the dimension of my favorite glasses, best fitting, best looking, etc. Then I plugged those specs into the website, this brought up all the glasses that I might like, but also eliminated sizes that will not work for me. I have ordered multiple frames from KZFOO and they arrive in mint or near mint condition. I will continue to order from them. PS. Everyone loves my sunglasses and no one has a pair like mine. 😊