The Flak 2.0 XL is based on the same basic design as the Flak but has a wider coverage for your field of view compared to the regular Flak 2.0. The design of these glasses is very modern and angular, as you would expect from Oakley as they have been a pioneer of this sport style and continue these incredible designs to this day. These have been made from Oakley\'s O Matter material which makes them ultra light and very durable for all day use. The earsocks and nosepads are made from Unobtainium which not only makes them very comfortable but also gives them tons of grip.