These are generic shape clip-ons and the goal is to get as close to your frame shape/size as possible without them being too snug or too big on your frame.
Sizing Help Method #1 How To Measure Your Glasses Selecting The Closest Shape/Size Yourself Follow this link to see our detailed clip-on help sizing page
Or Recommended Sizing Help Method #2 Let Us Help With Sizing
Follow this link for scanning directions and upload a scan of your glasses to us
You Only Need a Regular Household Printer/Scanner