After extensive testing, the US Army established 1250 mg/m2 as the ideal amount of permethrin - sufficient to keep the insects away, yet not so high as to cause problems for the wearer. Since the 1980s these levels have become accepted as a worldwide standard. The lower value of 200 mg was also established - once this level is reached, the garment needs to be replaced. It is these universally accepted standards that Rovince meet.