Bolle STKS 420 Cobalt Flash Polarised Safety Glasses - Black Frame - STK42N51E

 Available Versions 

STKS 420 safety glasses combine style, sustainability, and dependable eye protection for demanding outdoor work. Engineered by Bolle Safety, these streamlined frames are built for busy days on site and beyond.

Certified for serious protection and designed for lasting comfort, they pair durable materials with a modern athletic look. These Polarised Safety Glasses help keep vision clear in bright, high-glare conditions.

STKS 420 Polarized Lens Performance

Polarized lens - Outdoor Use

Approved for permanent wear, this lens technology delivers perfect optical quality for comfortable outdoor use.  The Cobalt Flash Polarised Safety Glasses are suited to users who need reliable comfort and clearer vision across challenging outdoor tasks. They are a practical choice for outdoor glare management.

• Tint base: Grey
• Visible Light Transmission: 13%
• Ideal for the maritime environment. Filters 99.99% of UVA/UVB.
• Reduces harsh glare and visual overload in bright outdoor settings
• Enhances contrast and surface visibility with a cold, neutral tone
• Blue mirror coating delivers a sleek style and minimizes glare from reflective surfaces.

Features:

The Bolle STKS 420 is made for all-day wear, with practical protection features and a lightweight feel. It supports comfort without compromising coverage. The Cobalt Flash Polarised Safety Glasses suit users working around glare, water, and reflective materials, offer a balanced combination of coverage, comfort, and outdoor usability.

• Sustainably crafted: 32% (plano) and 52% (prescription) recycled polycarbonate
• Crystal-clear vision with anti-scratch coating
• Enhanced protection comfort: Integrated side shields and upper brow protection for superior coverage
• Prescription-ready: Advanced lens treatments and wide prescription adaptability for precise vision correction
• Cobalt Flash Polarised Lens and Black Frame
• Polarised Safety Glasses help to prevent eye strain and glare. Polarised lenses offer the wearer increased comfort and reduced light sensitivity.

Technical Info

• Weight: 28 g
• Frame Type: Full Frame
• Frame Material: Recycled Polycarbonate
• Frame Colour: Translucent Black
• Lens Material: Polycarbonate
• Lens Colour: Grey
• Lens Coating: Anti-scratch
• Standards: EN ISO 16321-1
• Lens marking: GL3 CT 1 CE
• Frame Marking: 16321 CT 1-M CE UKCA