Natracare curved panty liners are breathable and provide daily protection that is soft and keeps you fresh. Ideally, the panty liner should be changed every 4 hours. Conventional panty liners are made of up to 90% plastic. Natracare panty liners are made from natural materials. This means that the panty liners are biodegradable, compostable and breathable. In addition, Natracare panty liners never contain perfumes, chlorine, dyes, latex or synthetic materials that can irritate the skin.