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 & angular, as you would expect from Oakley as they have been a pioneer of this sport style & continue these incredible designs to this day. These have been made from Oakley's O Matter material which makes them ultra light & very durable for all day use. The earsocks & nosepads are made from Unobtainium which not only makes them very comfortable but also gives them tons of grip.