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The Flexon COLLINS 600 eyeglasses bring proven memory metal technology to a clean, rectangular frame designed for men who need prescription eyewear that can keep up with daily life. Built with Flexon's signature titanium-nickel alloy—the same material NASA uses for missile heat shields—these frames flex, bend, and return to their original shape, making them exceptionally durable for active wear.
Memory Metal Technology That Forgives
Flexon frames feature memory metal in the temples and bridge, allowing them to withstand the kind of stress that would snap conventional metal frames. Drop them, sit on them, or twist them—the frames bounce back. This isn't marketing talk; it's a titanium-nickel alloy engineered to "remember" its shape. The full-rim metal construction provides stability for your lenses while keeping the overall weight low, and the adjustable nose pads let you fine-tune the fit without frequent trips to the optician.
Available in three finishes—Gunmetal, Brown, and Dark Slate Blue—and two lens widths (53mm and 55mm), the COLLINS 600 offers a modern rectangular silhouette that adds structure to round or oval faces. The 18mm bridge and temple lengths of 140mm or 145mm (depending on size) deliver a balanced fit for most adult men.
Prescription-Ready and Built to Last
These frames are fully prescription-ready and compatible with single-vision, progressive, and high-index lenses. The full-rim design seats lenses securely—a practical advantage when you're investing in quality optics. Flexon's construction combines the rim in monel or stainless steel with memory metal temples, a hybrid approach that holds solder joints well and ensures long-term durability.
The COLLINS 600 is a solid choice if you're replacing broken frames or upgrading to something more resilient. It's lightweight enough for all-day wear, strong enough to handle real-world use, and priced to make memory metal accessible.
Product Details
Product DetailsModel
FLEXON COLLINS 600Shape
Gender
Material
Bridge Type
Rim Type
Age Group
Color Details
Color DetailsColor Code
033Color Description
GunmetalFrame Color
Gunmetal
Color Code
210Color Description
BrownFrame Color
Brown
Color Code
210Color Description
BrownFrame Color
Brown
Color Code
033Color Description
GunmetalFrame Color
Gunmetal
Color Code
412Color Description
Dark Slate BlueFrame Color
Blue
Color Code
412Color Description
Dark Slate BlueFrame Color
Blue
Size Details
Size DetailsLens Width
53mmBridge Width
18mmSize
5318
Lens Width
55mmBridge Width
18mmSize
5518
Lens Width
53mmBridge Width
18mmSize
5318
Lens Width
55mmBridge Width
18mmSize
5518
Lens Width
55mmBridge Width
18mmSize
5518
Lens Width
53mmBridge Width
18mmSize
5318
Flexon COLLINS 600 Eyeglasses
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Found the frames I need to replace. Quick delivery and exactly what I needed! Thank you DesignerOptics!
Flexon FLEXON COLLINS 600 Eyeglasses
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Frequently Asked Questions
Are Flexon COLLINS 600 frames prescription-ready?
Yes, the Flexon COLLINS 600 eyeglasses are fully prescription-ready and compatible with single-vision, progressive, bifocal, and high-index lenses. The full-rim metal construction securely holds lenses of various thicknesses, making them suitable for a wide range of prescriptions.
What is Flexon memory metal and how does it work?
Flexon memory metal is a titanium-nickel alloy (NiTiNOL) that can bend, flex, or twist and return to its original shape. Originally developed using the same alloy NASA used for missile heat shields, the material "remembers" its set shape and automatically returns to it after stress, making these frames exceptionally durable and resistant to breaking.
What size options are available for the COLLINS 600?
The Flexon COLLINS 600 comes in two sizes: 53-18-140 (53mm lens width, 18mm bridge, 140mm temple length) and 55-18-145 (55mm lens width, 18mm bridge, 145mm temple length). Both sizes feature the same rectangular shape and are designed for adult men.
Are Flexon frames better than regular titanium frames?
Flexon frames use a titanium-nickel memory metal alloy that offers superior flexibility compared to pure titanium frames. While both are lightweight and corrosion-resistant, Flexon's memory metal can withstand more bending and twisting without permanent deformation. The COLLINS 600 combines memory metal temples with a monel or stainless steel rim for optimal lens retention and durability.
What face shapes work best with square/rectangular frames?
Square and rectangular frames like the COLLINS 600 work best for round and oval face shapes, as they add definition and balance to softer facial curves. The structured lines of the rectangular frame create contrast with rounded features, providing a flattering, modern look suitable for both professional and casual settings.
Do Flexon COLLINS 600 frames come with a warranty?
Yes, Flexon frames typically come with a manufacturer's warranty covering defects in materials and workmanship. The standard warranty period is 2 years from the date of purchase and covers manufacturing defects in the frame. The warranty does not cover damage from misuse or normal wear and tear.
Compare With Similar Frames
How the Flexon COLLINS 600 Eyeglasses stacks up against the closest alternatives we carry.
- Same memory metal technology and durability as COLLINS 600
- Similar rectangular shape and full-rim construction
- Comparable price point ($109.54–$116.31)
- Same proven memory metal construction
- Identical price range ($109.54–$116.31)
- Part of the same 600 collection with consistent quality
Read the full comparison
Flexon COLLINS 600 vs. EINSTEIN 600 vs. LARSEN 600: Which 600-Series Frame Is Right for You?
All three models share Flexon's signature memory metal technology—the titanium-nickel alloy that bends and returns to shape—but differ in styling and fit details. Here's how to choose:
Choose the COLLINS 600 if: You want a classic rectangular frame with three versatile color options (Gunmetal, Brown, Dark Slate Blue) and two size choices. The COLLINS offers a balanced, professional look that works equally well in the office or on weekends. Its clean lines and adjustable nose pads make it a safe bet for most face shapes, especially round and oval.
Choose the EINSTEIN 600 if: You prefer a slightly different rectangular aesthetic with similar durability and pricing. The EINSTEIN 600 shares the same memory metal construction and full-rim design, but with subtle differences in temple styling and bridge details. It's ideal if the COLLINS shape doesn't quite match your face or personal style preferences.
Choose the LARSEN 600 if: You're open to exploring other shapes within the 600 series. The LARSEN offers the same memory metal resilience and price point but may feature a different frame shape or width that better suits your facial proportions.
The Bottom Line: You can't go wrong with any 600-series frame—they all deliver the same proven memory metal technology at the same price. The COLLINS 600 stands out for its versatile rectangular shape, three color options, and two size choices, making it the most flexible option for buyers who want classic styling with modern durability. Try the virtual try-on or check the measurements carefully to ensure the best fit for your face.
At a Glance
Flexon EINSTEIN 600 Eyeglasses
Pros:
- Same memory metal technology and durability as COLLINS 600
- Similar rectangular shape and full-rim construction
- Comparable price point ($109.54–$116.31)
Cons:
- May have slightly different dimensions affecting fit
- Different aesthetic details in temple and bridge design
- Fewer color options compared to COLLINS 600's three finishes
Flexon LARSEN 600 Eyeglasses
Pros:
- Same proven memory metal construction
- Identical price range ($109.54–$116.31)
- Part of the same 600 collection with consistent quality
Cons:
- Different frame shape may not suit all face types
- Styling differences in temple design
- May have different size availability