Bolle Tracker safety glasses provides protection from all mechanical risks and also chemical risks, making it unique in the safety glasses range. The platinum permanent coating applied on both surfaces of the lens makes them highly scratch-resistant (1.4 cd/m), gives them a high resistance to the most aggressive chemicals and slows the appearance of fogging, Interchangeable foam reinforcement with indirect ventilation, Upper protection, Lower protection, Removable adjustable strap, Straight temples, Coatings anti-scratch, anti-fog Temple Version Lens Markings: 5-1, 4 1 BT KN CE Frame Markings: EN166 FT CE Strap Version Frame Markings: EN166 3 4 BT CE.