The sunglasses are a unisex model, with the measurements (in mm) 52/21/140. The first measure, 52 refers to the ‘eye size’, which is the width of the part of the frame that holds the lens. The bridge width of 21 refers to the width of the part that goes over the nose. The arms of the frame: 140 refer to the temple length. To see if this size works for you, either look at a pair of (sun)glasses that you currently own, or try a similar size to see how it fits you.