Abbeglasses offers 4 different frame sizes (XS, S, M, L) so choosing the right one is key to making sure your new glasses correctly fit your face. Each size group is based on frame width.
The width includes lens and bridge widths in millimeters. Look on the inside of the temple arm to find your frame measurements.
Most eyewear brands print these details in a similar spot; if you already have a pair that you like, you can compare measurements to see how a certain frame of ours will fit you.