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Featuring a one-of-a-kind SpringFlex™ temple, the Springer delivers our face-hugging fit in an unprecedented way. The temples adjust to wider facial profiles by gently bending at a built-in pivot point created by a molded spring in the temple itself. Why does this matter? When rigid spectacles are pulled wider than their natural structure to accommodate a more perfect fit for wider faces, a bowing or straightening of the lens may take the eyewear out of compliance. All of Brass Knuckle’s Flex temple eyewear prevents this outward bowing — but Springer does it like nothing else. Add to that soft thermoplastic rubber (TPR) temple tips and nosepiece in stylish sky blue, and Springer sails to the top of the class in style.

Certifications and characteristics

Standard anti-fog performance plus abrasion, chemical, and UV resistance. Meets demanding industry test requirements (ANSI Z87.1+, EN166UV).

Clear lens allows maximum light transmission without changing or distorting vision or colors (91% of light passes through).

Smoke lens provides allover tint for normal outdoor conditions (18% of light passes through).

About the Springer

Springer’s SpringFlex™ temple design can’t be bent out of shape! Bend it at a right angle and watch it spring back to its naturally curved, molded-to-fit-the-face form. The pliable TPR temple tips provide a secure fit without uncomfortable pressure points. Two-piece durable polycarbonate lenses block 99.9% of the sun’s ultraviolet rays.


  • High-gloss polycarbonate frame and nose pad
  • Naturally curved, flexible temples for fit/comfort
  • TPR temple tips and nosepiece in sky blue
  • ANSI-rated hardcoated polycarbonate lenses
  • Standard anti-fog protection

Part Number Anti-Fog Lens Color Frame Color Accent Color
Standard Clear Black Blue
Standard Smoke Black Blue

Roll Up Your Sleeves and Tear In

BKFLEX-4010 Brochure (pdf)

Brass Knuckle Eye Protection Catalog (pdf)