These are new/unissued replacemnt leather sweat bands for the PASGT Helmet. There is 2 styles to choose from. The old style has metal clips and is a thinner band, while the newer style is velcro attachment and is much wider. For 1980s/1990s clone helmets use the old style for period correctness. If you plan on wearing the helmet, or are going for a GWOT style helmet, use the new style (they are more comfortable).