Safety sunglasses are made to high quality specifications in order to meet the requirements of the European CE EN-166-F and American ANSI Z87.1 standards . They must pass six different tests for optical quality plus three different tests for impact resistance including a test that shoots a 1/4 inch steel ball at over 100 mph and leaves no more than a dimple on the lens. Remember all our prices include free UK P&P, international orders are just £2.97 extra...