Tactical Threads makes hearty tactical gear and we wanted our sunglasses to follow suit! We wanted them rugged so when we train or fight they can withstand the abuse, so we hired the best out there, Legion Optix! Together we produced an AR 670-1 compliant polarized glasses that come in 2 colors, black and olive green. We also made it so that the arms are detachable in the event you roll on them and pop off the arm, you simply pop them back on! You can not and will not find a more durable and polarized pair of sunglasses for this price guaranteed!