Product Details
Color Details
Size DetailsFrequently Asked Questions
What's the difference between the Flak 2.0 S and the Flak 2.0 XL?
Can I get prescription lenses in the Oakley Flak 2.0 S?
What sports are the Flak 2.0 S sunglasses best for?
Do the Flak 2.0 S sunglasses stay secure during activity?
What is Prizm lens technology and how does it work?
Are the Flak 2.0 S sunglasses suitable for smaller or narrower faces?
Compare With Similar Frames
How the Oakley Flak 2.0 S 9511 Sunglasses stacks up against the closest alternatives we carry.
- Larger lens coverage for maximum peripheral protection
- Extended lower lens curve prevents cheek contact on larger faces
- More frame color and lens options available
- Taller shield lens provides more vertical coverage
- Better for aggressive riding positions (head down)
- Single-lens design eliminates frame in lower vision
- Lower price point ($97.53–$225 vs $214–$267)
- Similar semi-rimless design and fit
- Proven platform with years of use
Read the full comparison
Oakley Flak 2.0 S vs. Flak 2.0 XL: Which Size Is Right for You?
The most common question about the Flak 2.0 S is how it compares to the Flak 2.0 XL. Both frames share the same chassis, O-Matter construction, Unobtainium grips, and Prizm lens compatibility—the only difference is size. The Flak 2.0 S (OO9511) is scaled down for smaller faces, women, and youth, while the Flak 2.0 XL (OO9188) offers extended lens coverage for standard and larger face shapes.
If standard sport sunglasses feel too large, slide down your nose, or create gaps around your temples, the Flak 2.0 S is the better choice. The 59mm lens width and compact frame dimensions provide a secure, comfortable fit without sacrificing performance. The Flak 2.0 XL, on the other hand, is ideal if you want maximum coverage and have a medium to large face—the taller lenses and extended lower curve prevent cheek contact and offer more peripheral protection.
Flak 2.0 S vs. Radar EV Path: Semi-Rimless or Shield?
The Oakley Radar EV Path 9208 is another top choice for athletes, but it takes a different design approach. The Radar EV features a single shield lens that provides maximum vertical coverage and eliminates the frame from your lower field of view—preferred by cyclists in aggressive positions and runners who want the most unobstructed vision possible. However, the shield design feels more enclosed and the larger footprint may not fit smaller faces as well as the Flak 2.0 S.
The Flak 2.0 S offers a more versatile, open feel with its semi-rimless design. It's lighter (around 24g vs. the Radar EV's slightly heavier build) and works across a wider range of sports—baseball, golf, fishing, and casual wear—where the Radar EV is more cycling- and running-focused. If you prioritize fit on a smaller face and multi-sport versatility, the Flak 2.0 S is the smarter pick.
Flak 2.0 S vs. Half Jacket 2.0 XL: Old vs. New
The Half Jacket 2.0 XL 9154 is the predecessor to the Flak 2.0 series and still a solid performer, but the Flak 2.0 S represents an updated design. The Flak 2.0 S has taller lenses for better coverage, a more modern look, and broader Prizm lens availability. The Half Jacket 2.0 XL is a budget-friendly option if you're looking for a proven semi-rimless sport frame at a lower price point ($97.53–$225), but the Flak 2.0 S offers better value for the performance and style you get.
Our recommendation: If you have a smaller face or find standard sport sunglasses too large, the Flak 2.0 S is the clear choice. It delivers the same performance as the Flak 2.0 XL in a size that actually fits, with all the lens options and features you need for serious sport use.
At a Glance
Oakley Flak 2.0 XL 9188 Sunglasses
Pros:
- Larger lens coverage for maximum peripheral protection
- Extended lower lens curve prevents cheek contact on larger faces
- More frame color and lens options available
- Preferred by athletes who want maximum coverage
Cons:
- Too large for smaller faces, women, and youth
- Slightly heavier than the S version
- Can sit too low or feel loose on narrower faces
- May obstruct vision on smaller face shapes
Oakley Radar EV Path 9208 Sunglasses
Pros:
- Taller shield lens provides more vertical coverage
- Better for aggressive riding positions (head down)
- Single-lens design eliminates frame in lower vision
- Popular among competitive cyclists and runners
Cons:
- Larger overall footprint may not fit smaller faces well
- Shield design can feel more enclosed
- Higher price point ($147.92–$297 vs $214–$267)
- Less versatile across multiple sports than the Flak platform
Oakley Half Jacket 2.0 XL 9154 Sunglasses
Pros:
- Lower price point ($97.53–$225 vs $214–$267)
- Similar semi-rimless design and fit
- Proven platform with years of use
- Compatible with some Flak lens options
Cons:
- Older design lacks the updated styling of the Flak 2.0 S
- Shorter lens height provides less coverage
- Not available in as many Prizm lens options
- Feels less modern compared to the Flak 2.0 platform