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Size Guide
Sienna Alexander London - Size Guide
The best way to figure out if a pair of sunglasses will fit you, is to measure a pair of sunglasses that you already have and you like, and compare the below dimensions.
Nose Bridge Width is measured in mm and is the distance between the lenses
Frame Height is measured in mm and is the height of the frame
Lens width is measured in mm and is the horizontal distance between the bridge and the temple