The SG-YCB is a pair of safety glasses with a clear 420cut blue light blocking lens. Constructed from tough yet flexible nylon polymer, it has the design qualities to survive wherever you use it. It has tough polycarbonate lenses which have 99% UV A/B/C protection and anti-scratch/anti-fog coatings. For comfort and stability, there are rubberised inner arm and nose grips. Tough flexible polycarbonate frame 8-base curved toughened polycarbonate lenses Clear 420cut blue light blocking lenses Blocks harmful HEV blue light up to 420nm K & N anti-scratch & anti-fog lens coatings 99% UV A/B/C protection (EN170) Flexible PC & TPR co-injected side arms Adjustable rubberised non-slip nose pads Reinforced nose bridge Micro-fibre drawstring storage bag included Lens markings Lens filters: 2C (UV EN170) 1.2 (clear) Optical class: 1 (high optical quality) Lens coatings: anti-scratch - K anti-fog - N Mechanical risk: low energy impact - F High speed particles at extreme temperatures - T