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Fossil 3100 Sunglasses - designeroptics.com
Fossil 3100 Sunglasses
Add To Cart For Lowest Price
$43.52
$55.00

You save 21%

Color

ADD PRESCRIPTION

Fossil 3100 Sunglasses

0807-IR - Black - Gray Blue

  • Ships within 1 to 5 Days

    Shipping information is provided by the manufacturer.

FO3100_S_0807_IR_5318
ADD PRESCRIPTION
Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses Fossil 3100 Sunglasses 0807-IR - Black - Gray Blue 0807-IR - Black - Gray Blue 0807-IR - Black - Gray Blue 0807-IR - Black - Gray Blue 0KB7-QT - Gray - Green 0KB7-QT - Gray - Green 0KB7-QT - Gray - Green 0KB7-QT - Gray - Green 0N9P-QT - Matte Havana - Green 0N9P-QT - Matte Havana - Green 0N9P-QT - Matte Havana - Green 0N9P-QT - Matte Havana - Green
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
Fossil 3100 Sunglasses
0807-IR - Black - Gray Blue
0807-IR - Black - Gray Blue
0807-IR - Black - Gray Blue
0807-IR - Black - Gray Blue
0KB7-QT - Gray - Green
0KB7-QT - Gray - Green
0KB7-QT - Gray - Green
0KB7-QT - Gray - Green
0N9P-QT - Matte Havana - Green
0N9P-QT - Matte Havana - Green
0N9P-QT - Matte Havana - Green
0N9P-QT - Matte Havana - Green
  • Free Shipping
    Free Shipping
  • Price Match
    Price Match
  • Easy Returns
    Easy Returns
  • Licensed Opticians
    Licensed Opticians
ADD PRESCRIPTION
Add To Cart For Lowest Price
$43.52
$55.00

You save 21%

Color

0807-IR - Black - Gray Blue
0KB7-QT - Gray - Green

*Swipe to view more color variants

  • Free Shipping
    Free Shipping
  • Price Match
    Price Match
  • Easy Returns
    Easy Returns
  • Licensed Opticians
    Licensed Opticians
DESCRIPTION RATINGS & REVIEWS PRESCRIPTION GUIDE

The Fossil 3100 Sunglasses deliver classic rectangle styling in a durable acetate frame that's built for everyday wear. Available in black with gray-blue lenses and gray with green lenses, these full-rim frames feature a two-tone design—the front in matte black or gray contrasts with glossy blue or gray temples—plus subtle metal accents at the hinges that add a refined touch without the weight.

Acetate Construction for Comfort and Flexibility

Acetate is a plant-derived material that's hypoallergenic, lightweight, and flexible. The 3100's acetate construction won't irritate sensitive skin, and the material adapts slightly to your face over time for a custom fit. Fossil's flexible spring hinges reduce pressure behind the ears and help the frames hold their shape through daily use. At 53mm lens width, 18mm bridge, and 140mm temples, the fit suits most medium to large faces. Rectangle frames like these work especially well for round face shapes—the angular lines add definition and balance softer features.

Prescription-Ready and UV Protected

These frames accept prescription lenses, so you can add single-vision, progressive, or bifocal lenses through your optician or our lens service. The included lenses provide UV protection for bright-day wear.

Fossil has built a reputation for affordable quality since 1984, and the 3100 fits that tradition—straightforward styling, solid materials, and a price that doesn't require a second thought if you need a reliable daily pair.

Product DetailsProduct Details

Color DetailsColor Details

Size DetailsSize Details

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Customer Reviews

Based on 1 review
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J
JC
Great product, quick shipment

Exactly what I needed

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Frequently Asked Questions

Can I add prescription lenses to the Fossil 3100 Sunglasses?

Yes, the Fossil 3100 is prescription-ready and accepts single-vision, bifocal, and progressive lenses. The full-rim acetate construction provides a secure lens seat, and the 53mm lens width offers enough surface area for most prescriptions. You can order prescription lenses through Designer Optics' lens service or take the frames to your local optician.

What face shapes work best with rectangle sunglasses?

Rectangle sunglasses like the Fossil 3100 are ideal for round and oval face shapes. The angular frame lines contrast with softer facial curves, adding definition and making the face appear longer and more structured. They also work well for heart-shaped faces by balancing a wider forehead with the frame's horizontal emphasis.

What are the benefits of acetate frames?

Acetate frames are hypoallergenic, lightweight, and more durable than standard plastic. The material is plant-based, flexible enough to mold slightly to your face for comfort, and holds rich colors well. Acetate also resists breakage better than injection-molded plastic, making it a smart choice for daily-wear sunglasses.

What size are the Fossil 3100 Sunglasses?

The Fossil 3100 measures 53mm lens width, 18mm bridge width, and 140mm temple length (53-18-140). This is a medium to large fit that suits most adult faces. The 53mm lens width provides good coverage without overwhelming smaller features, and the 140mm temples are standard length for men's frames.

Do the Fossil 3100 Sunglasses have UV protection?

Yes, the Fossil 3100 Sunglasses include UV-protective lenses that shield your eyes from harmful ultraviolet rays. This protection is essential for outdoor wear and helps prevent long-term eye damage from sun exposure. If you add prescription lenses, UV protection can be included in those as well.

Are Fossil sunglasses good quality?

Fossil sunglasses are known for offering solid quality at an affordable price point. Customer reviews consistently praise the lens clarity, comfortable fit, and durability. Many owners report their Fossil frames lasting for years with daily wear, and some compare the lens quality favorably to higher-priced brands.

Compare With Similar Frames

How the Fossil 3100 Sunglasses stacks up against the closest alternatives we carry.

This product
Fossil 3100 Sunglasses
Fossil Fossil 3100 Sunglasses $55.00$43.52
Fossil 3102 Sunglasses - designeroptics.com
Fossil Fossil 3102 Sunglasses $55.00$35.07
  • Slightly lower starting price ($35.07)
  • More color options available
  • Same acetate construction quality
View frame →
Fossil Fos3091 Sunglasses - designeroptics.com
Fossil Fossil Fos3091 Sunglasses $55.00$43.10
  • Same price range ($43.10-$43.52)
  • Similar acetate construction
  • Prescription-ready like the 3100
View frame →
Read the full comparison

Fossil 3100 vs. Similar Fossil Rectangle Sunglasses

If you're considering the Fossil 3100, you might also be looking at the Fossil 3102 or Fos3091—both rectangle acetate frames in the same price range. Here's how they compare.

Fossil 3100 vs. Fossil 3102

The 3102 is part of the same numbered series and shares the acetate construction and prescription-ready design. The main difference is price: the 3102 starts at $35.07, making it slightly more affordable. It also offers more color variations. However, the 3100's two-tone design with metal hinge accents gives it a more refined look, and the specific black/gray-blue and gray/green combinations are distinctive. If you prefer the 3100's color options and don't mind spending a few dollars more, it's the better choice for style.

Fossil 3100 vs. Fossil Fos3091

The Fos3091 sits at the same price point ($43.10-$43.52) and offers similar acetate quality and prescription compatibility. The decision comes down to fit and design details—temple styling, color options, and how the frame proportions suit your face. The 3100's 53-18-140 sizing is a safe medium-large fit; if the Fos3091 has different dimensions, that could be the deciding factor. Both are solid everyday frames from a brand known for durability and value.

Bottom line: The Fossil 3100 stands out for its two-tone acetate design and metal hinge details at a competitive price. If those specific colors appeal to you and the fit works, it's a strong pick. The 3102 saves a few dollars, while the Fos3091 offers an alternative at the same price—worth comparing if you want to see all your rectangle-frame options from Fossil.

At a Glance

Fossil 3102 Sunglasses

Pros:

  • Slightly lower starting price ($35.07)
  • More color options available
  • Same acetate construction quality

Cons:

  • May have different temple styling
  • Fewer customer reviews available
  • Color options may not suit all preferences

Fossil Fos3091 Sunglasses

Pros:

  • Same price range ($43.10-$43.52)
  • Similar acetate construction
  • Prescription-ready like the 3100

Cons:

  • May have different fit dimensions
  • Different color palette
  • Potentially different temple design

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