The rise of metal square sunglasses isn’t just a trend—it’s a calculated response to consumer demands for durable, high-performance eyewear that balances urban aesthetics with outdoor functionality. As a specialized manufacturer in metal-PC hybrid frames and polarized lenses, we’ve engineered every component to empower your brand’s growth. Here’s what sets our products apart—and why bulk buyers keep returning.
1. Frame Construction: Where Metallurgy Meets Polymer Science
Our metal square sunglasses have stainless steel for the frame—a material chosen for its hypoallergenic properties and resistance to saltwater corrosion (critical for coastal retailers). Encasing this core is reinforced polycarbonate (PC) molded at 280°C, creating a lightweight shell that absorbs impact forces up to 130J (tested via ANSI Z80.3-2015 standards). This fusion achieves a 55-58g total weight—22% lighter than full-metal competitors—while maintaining the rigidity needed for sports and daily wear.
The square silhouette isn’t just stylish; its 90-degree angles allow 6-point pressure distribution, eliminating the “hot spots” that cause 73% of comfort-related returns (based on 2023 eyewear industry data). For buyers targeting extreme sports markets, we offer TPE-coated nose pads with 360° adjustability, tested to withstand -30°C ski conditions without hardening.
2. Polarized PC Lenses: Optical Precision for Niche Markets
Unlike cheap PET lenses that distort colors, our 5-axis CNC-milled PC lenses maintain <0.1% wavefront distortion, crucial for applications like fishing or driving where visual accuracy matters. The polarization filter isn’t a simple film—it’s chemically bonded during injection molding, ensuring:
UV400 protection (blocks 100% of UVA/UVB/UVC)
Glare reduction ≥98% (tested at 560nm wavelength)
Hydrophobic coating that repels water/oil (contact angle: 115°)
Need to tailor lenses to specific environments? We provide:
VLT (Visible Light Transmission) customization: 8% for glacier expeditions, 18% for cycling, 80% for night driving
Mirror coatings: Dual-layer deposition for iridescent effects (rose gold, blue shift) popular in fashion markets
Laser-etched branding: Micro logos at the lens edge (min. 0.8mm height)
3. Customization: Turn Generic Products into Brand Assets
Our 12-stage customization workflow transforms bulk orders into signature collections:
A. Metal Frame Customization
Logo techniques:
Laser engraving (0.1mm depth precision, 5000dpi resolution)
Electrochemical etching (ideal for matte finishes)
Magnetic plate inserts (for interchangeable branding)
Color options:
PVD coatings (gunmetal, rose gold) with 5-year fade warranty
Gradient anodizing (MOQ 1,000 units)
B. Packaging & Compliance
Retail-ready boxes: FSC-certified paper with embossed logos
Regulatory support: CE, FDA, and UKCA documentation included
Amazon optimization: Prep services for FBA sellers (ASIN stickers, polybagging)
4. Why Wholesalers Trust Our Supply Chain
Transparent production: Live factory tours via Zoom (bookable weekly)
Rigorous QC:
3D scanning checks frame symmetry (±0.03mm tolerance)
Polarization validation with digital lux meters
Salt spray testing (simulates 5-year coastal exposure)
Inventory solutions:
30% deposit to start production
60-day payment terms for repeat orders
Emergency 15-day rush service
Your Next Step: Claim Free Custom Samples
We’re offering qualified buyers free customized samples (frame + lens) to test quality firsthand. Here’s how:
Contact us via WhatsApp/Email with your:
Target market (e.g., beach resorts, ski shops)
Desired logo technique
Annual order estimate
Receive samples in 7 working days
Approve production with a 5% deposit (deductible from final invoice)
Limited offer: First 20 responders get free UV400 test reports for local compliance.
