Burberry BE4221 are round shaped sunglasses made of plastic acetate material which is both lightweight and durable. The lenses are completely U.V. protecting. Burberry BE4221 are available in size 55x21. designerglasses.co.uk offers this frame in various colours including: Burberry BE4221 3595K4 Black/Polarized Blue Gradient and Burberry BE4221 35945V Matte Black/Grey. designerglasses.co.uk is one of the oldest optical sites on the internet.