Natracare

From their website:

For over 25 years Natracare has been the world leader in organic and natural feminine hygiene having started the campaign to educate women about the health and environment issues of using conventional tampons and pads back in 1989.
Created by Susie Hewson out of concern for the damaging effects of dioxin pollution on women's health and the environment, Natracare was launched in 1989 with a full range including the world's first certified organic cotton tampons and totally chlorine-free, plastic-free sanitary pads and panty liners.
This multiple award winning brand boasts almost 30 products all made from only certified organic cotton and GMO-free plant derived materials from sustainable and renewable resources, that are biodegradable and compostable.