Bolle Safety Harper Broblu Safety Glasses Grey/BlueBolle Safety Harper Broblu Safety Glasses Grey Blue Bolle Safety Harper BroBlu Safety Glasses TR90 lightweight full rectangle Frame Grey blue Polycarbonate lens for resistance and optical clarity Embedded ProBlu 420 technology Technology in the core of the lens Nylon PC curved frame This unisex and bold frame comes with PrB lenses absorbing 80% of harmful bluelight at 445nm Supplied with hard case, microfibre cloth, user instruction Lens marking 2C 1.