Conforms to EN 166/170/172 1BT 34 K & N . Provides the comfort of a safety spectacle with the fit and seal of a goggle. Interchangeable foam seal gives added brow and cheek protection plus the adaptability of a fully adjustable strap that can also be removed. Straight sports temples.  Optical class 1 anti-scratch and anti-mist polycarbonate lenses.  Wraparound base 8 curve.  Fantastic field of vision and side ventilation.  Excellent all round protection. Prescription insert is available that can be glazed to all prescriptions.  Supplied with micro fibre pouch.