How to Read Sunglasses Size Numbers Before You Order
Find a pair you wear comfortably for hours. Its temple markings and front width give you a useful reference when you compare a new frame online.

What does 55 □ 17 145 mean?
Read the figures in millimeters. The first is the width of one lens, the second is the bridge width and the last is the length of the temple to its tip. Look for Lens, Bridge and Temple on the product page.
Measure the front separately
Rest your open glasses on a sheet of paper. Mark the outermost edge on each side of the front and measure between the marks. Simply adding two lens widths and the bridge leaves out the rims and the hardware at the corners.
Compare two real frames
ALIENY SUN I has a 146 mm front, a 55 mm lens and a 17 mm bridge. FREQUENCY SUN has a 144 mm front, a 44 mm lens and a 27 mm bridge. Both have 145 mm temples. Their overall widths are close, but the opening at the nose is quite different.
Check the fit when the pair arrives
Tip your head forward, then smile. See whether the frame slips, the lower rims catch your cheeks or the temples press above your ears. Before having the frame adjusted, check the seller’s return conditions.
Manufacturer’s measurements · ALIENY SUN / FREQUENCY SUN