Black Knight Stiletto Eyeguards feature a scratch resistant lenses of high impact polycarbonate. Optically correct lenses with no distortion make sure that you can see every ball. Anti-fog coating and flow through ventilation to eliminate fogging and bayonet temple arms for a secure, comfortable fit. Stiletto models meet the ASTM safety standard for racquet sports. Black Knight eyeguards are the official eyeguards of several sports associations and relied upon at all levels of competition.