The Chemex filter is folded into a cone shape, exactly as in laboratory techniques. This assures uniform extraction since the water filters through all the grounds on its way to the apex of the cone. The Chemex filter is guaranteed not to burst under the weight of the liquid during filtration, and not to break when lifting out the grounds.
Fully-bodied, richer flavor, from less coffee, and as strong as you like without bitterness - that's what the Chemex filter gives you.