Determine your size
To determine your size, take a ruler and measure the arm-to-arm distance of your current glasses in millimetre.
![](../../Themes/NewiGlass/Content/images/ChoosingRulerOnFrameMedium_s.jpg)
Using the Product Size Filter
Once you have the measurement in millimetre (mm), follow the guide below to find your size
120 mm or less: XX-Small
120 mm - 125 mm: X-Small
125 mm - 130 mm: Small
130 mm - 139 mm: Medium
140 mm - 145 mm: Large
145 mm or more : X-Large
120 mm - 125 mm: X-Small
125 mm - 130 mm: Small
130 mm - 139 mm: Medium
140 mm - 145 mm: Large
145 mm or more : X-Large
Use Size filter to select your size.
![](../../Themes/NewiGlass/Content/images/choosing-size-filter-medium_s.jpg)
Note: If your current glasses do not fit well, use them as a gauge towards a better fitting pair. For example, if your glasses currently measure 125 mm and they feel a bit small (temple arms are pressing against the sides of your face), go up a size.
![](../../Themes/NewiGlass/Content/images/prescription_sunglasses_bottom_left.jpg)
See Better and Feel Better with iLook Glasses