Silk thread is one of nature’s strongest natural fibers and the only natural fiber strong enough to be made into floss. Silk Floss is a 100% natural product that can biodegrade and causes no impact on the environment after use. We here at RADIUS believe this is a very important offering for our consumers and our environment. For consumers who are looking for a vegan option, we do also offer Vegan Mint and Vegan Cranberry flosses which are made from nylon rather than pure silk.