Oakley SI Ballistic M Frame 2.0 Hybrid with Black Frame and Grey Lens Earplugs The PTX Rx Insert can

The PTX Rx Insert can accommodate prescriptions in the range of +/-6

Designed for durability and comfort

1 when used with Porta Stream II and III

The USB power adapter can be used to charge your portable accessories

Spatula temples for individualized fit and comfort

Oakley SI Ballistic M Frame 2.0 Hybrid with Black Frame and Grey Lens Earplugs The PTX Rx Insert canIntroduced in 2006, the tough Oakley SI Ballistic M Frame 2. 0 Tactical Sunglasses were designed more for battle than for beauty. The most obvious change from the regular M Frame is the thicker, more rugged frame. The wide elbows past the temple hinge were brought in to better accommodate helmets or other headgear, but the temples also became stronger, opting for a more vertical profile. The ridges not only enhance the overall integrity, but also lend