[2020 VALENTINE'S DAY SALE!] All aluminium clip and polycarbonate lens! No flimsy and fragile plastics! Objective light weight: only 0.45oz with sturdy lightweight aluminium construction and robust sports grade polycarbonate lens! Lighter than fitovers! Blocks 99% of blue light up to 500nm including UV light! Cut out LED and fluorescent lighting glare! BPI 500 equivalent (Note: not all blue blockers on the market block till 500nm)