This V60 filter is made using soft, organic cotton. It fits on any V60-02 or Chemex brewer, and comes in a pack of two - so you've always got a spare.
We love the difference this filter makes. Not only are you reusing your filter, you're also creating a totally different flavour profile than you would get with paper or metal filters. Cloth filters allow more oils through and therefore give you more body - without sacrificing complexity.
We've found that brew times using a CoffeeSock are a little faster (20-30s) than when using the same coffee with a paper filter. You may need to make your grind a little finer than what you would normally use for paper filter.