Bloc Twenty Five Bloc Twenty Five Shiny Black/Grey Flash
Bloc Twenty Five Bloc Twenty Five Crayon/Blue Mirror
Bloc Twenty Five Bloc Twenty Five Shiny White/Red Mirror
Bloc Twenty Five Bloc Twenty Five Matt Black/Blue Mirror
Bloc Twenty Five Bloc Twenty Five Lenses

Bloc Twenty Five

£45.00

Bloc Twenty Five sunglasses are the ideal partner for outdoor activities and are designed to provide total protection.

Stock Codes and Packed Weights

Bloc Twenty Five

Shiny Black/Grey Flash (X900)
£45.00
2 In Stock
Crayon/Blue Mirror (XCB90)
£45.00
4 In Stock
Shiny White/Red Mirror (XSWR90)
£45.00
3 In Stock
Matt Black/Blue Mirror (XMB90)
£45.00
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Bloc Twenty Five sunglasses are the ideal partner for outdoor activities and are designed to provide total protection.

The distortion free, impact resistant XTR Karbon8 optical class one blue category 3 lenses provide maximum protection against UVA, UVB and other harmful blue light up to 400nm. The non-slip hypoallergenic temple tips are designed for comfort and fit and they have a screw-free sports clip hinge. No matter what activities you are doing your vision will not let you down.

  • Acrylic frames
  • Screw-free sports clip hinge
  • Category 3 lenses.

Tested to: BS EN ISO 12312-1:201.

Category        Usage
0 Not really a category - transmits 100% of visible light. Protection against grit and ice only. 
1 43% - 80% visible light transmitted. Suitable for use in cloudy conditions with virtually no direct sunlight eg blizzards and whiteouts 
2 18% - 43% visible light transmitted. Suitable for use as general sunglasses and in cloudy conditions in the mountains, but not in direct sunlight in mountain areas where there will be a lot of reflection off snow and ice.
3 8% - 18% visible light transmitted. Suitable for Alpine and Himalayan mountaineering for most uses, but for prolonged exposure at high altitude Category 4 is recommended.
4 3% - 8% visible light transmitted. For prolonged exposure at high altitude and especially if you have weak eyes. Will be found too dark for everyday use and should not be used for driving a car.

*Categories 3 and 4 are the only categories suitable for Alpine and Greater Ranges mountaineering - however, just because the lenses are suitable does not mean that the design of the glasses is.

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